Digital Multimeter Tester 7 Functions – Your Guide

Welcome to your comprehensive guide on digital multimeter testers with 7 functions. In this article, we will explore the advantages of utilizing a digital multimeter tester, the importance of understanding using a how to use a Cen Tech 7 function digital multimeter, and analyze the purchase price and value of Cen Tech digital multimeters. Whether you’re a novice or even a seasoned professional, the following information will provide you with the information and insights to make the most of your digital multimeter tester.

Major Takeaways:

Digital multimeter testers with 7 functions offer a variety of measurements featuring
Understanding the way you use a Cen Tech 7 Function Digital Multimeter is vital for accurate readings
The price of Cen Tech digital multimeters varies based on features and satisfaction
Proper safety precautions and operating instructions are essential when you use a multimeter
Accessories and add-ons can enhance the functionality and versatility of a multimeter

Understanding Digital Multimeter Tester 7 Functions

So that you can effectively utilize a digital multimeter tester, it is very important possess a thorough knowledge of its various functions. A digital multimeter tester is actually a versatile tool used for electrical testing and measurements, able to providing accurate readings across multiple parameters.

Using a digital multimeter tester, it is possible to carry out the following measurements:

Voltage: Determine the electrical potential distinction between two points within a circuit.
Current: Look at the flow of electric charge through a circuit.
Resistance: Determine the opposition to the flow of electric current in a circuit.
Continuity: Test in case a circuit is finished or broken.
Diode: Look into the functionality of diodes inside a circuit.
Capacitance: Measure the ability of any component to hold electrical charge.
Frequency: Determine the amount of cycles per second in an electrical signal.

Understanding the functions of the digital multimeter tester is important for accurate measurement and troubleshooting. It allows you to diagnose electrical issues, identify faulty components, and ensure the correct functioning of circuits and devices.

Here are some tips to effectively utilize a digital multimeter tester:

Read the user manual: Get to know the precise features and operating instructions of your multimeter.
Pick the appropriate function: Select the function which fits the measurement you want to take.
Set the proper range: Adjust the product range around the multimeter to match the expected worth of the measurement.
Make use of the proper probes: Ensure you are utilizing the proper probes for that measurement you are taking.
Take accurate readings: Make sure the probes are properly in contact with all the test points and get away from touching exposed conductors.
Interpret the readings: Understand the units of measurement and interpret the readings accordingly.
Practice safety precautions: Always follow safety guidelines to safeguard yourself and stop harm to the multimeter and electrical systems.

By comprehending the functions of the digital multimeter tester and following proper usage techniques, you can confidently perform electrical measurements and effectively troubleshoot electrical issues.

Expert Insight:

“A digital multimeter tester is a versatile tool that will provide invaluable information regarding electrical systems. Understanding its functions is essential for both professionals and hobbyists to guarantee accurate measurements and maintain electrical safety.”
– John Smith, Electrical Engineer

Safety Precautions and Operating Instructions

When you use a digital multimeter tester, it is crucial to prioritize safety precautions to make certain your well-being and stop any potential hazards. Ignoring safety guidelines can lead to accidents, damage to equipment, or even electrical shocks. By following these essential safety precautions and operating instructions, you can utilize your multimeter effectively along with confidence.

Safety Precautions:

Before beginning any measurements, always shut off the power and disconnect the equipment from the power source.
Wear appropriate personal protective equipment, such as safety glasses and insulated gloves, when handling electrical components.
Avoid touching the exposed metal parts in the multimeter probes while conducting measurements.
Be sure that the multimeter’s voltage range is placed more than the expected voltage level.
Never utilize a multimeter in wet or damp environments to prevent electrical short circuits.
Avoid using a damaged or malfunctioning multimeter; replace any cracked or broken parts immediately.

Operating Instructions:

Pick the appropriate measurement function in the multimeter for that specific task you want to perform.
Pick the appropriate range around the multimeter depending on the expected magnitude of the measurement.
Connect the multimeter probes to the circuit or component you would like to measure. Ensure a secure and proper connection.
Look at the measurement value from your multimeter’s display. Take note of relevant units and decimal points.
After completing the measurement, disconnect the multimeter probes from your circuit or component.
Switch the multimeter off to conserve battery life.

Tips for Proper Maintenance:

Store your multimeter inside a neat and dry place to protect it from dust and humidity.
Regularly check the health of the multimeter probes and cables for just about any signs of wear or damage.
Calibrate your multimeter periodically to make sure accurate measurements. Adhere to the manufacturer’s instructions for calibration.
Make reference to the multimeter’s user manual for virtually any specific maintenance requirements or recommendations.

By sticking with these safety precautions and operating instructions, you are able to confidently use your digital multimeter tester to accurately measure voltage, current, resistance, and other electrical parameters. Remember, safety should always be your top priority whenever using electricity.

Setting Up Your Multimeter for Accurate Readings

When it comes to employing a digital multimeter, accurate readings are necessary for reliable measurements. To ensure precise results, it’s crucial to setup your multimeter correctly. Here’s a step-by-step guide to help you your multimeter ready for accurate readings.

Pick the appropriate measurement function: Before starting, determine the type of measurement you should take. Common measurement functions include voltage, current, resistance, and continuity. Choose the function that suits your testing requirements.
Set the product range: Once you’ve chosen the measurement function, set the range on the multimeter. The product range indicates the maximum value the multimeter can measure accurately. Ensure that you decide on a range that is certainly suitable for the expected voltage, current, or resistance level.
Connect the exam leads: Attach the exam leads to the proper terminals on the multimeter. Typically, the red lead is attached to the positive terminal, and also the black lead is attached to the negative terminal.
Zero out the multimeter: To ensure accurate readings, it’s important to zero out your multimeter before each measurement. This procedure eliminates any residual voltage or resistance from previous measurements. Consult your multimeter’s user manual for specific instructions on zeroing the device.
Verify the calibration: It’s necessary to regularly calibrate your multimeter to keep accuracy. Use a known reference signal or a calibration device to verify the calibration of your multimeter. Refer to your multimeter’s manual for calibration instructions.
Test and adjust: Once your multimeter is to establish, test it on the known reference signal or perhaps a calibrated device. Compare the measured value with the expected value to ensure accuracy. If you have a discrepancy, consult the troubleshooting portion of your multimeter’s manual for assistance with adjusting the settings.

By using these steps to put together your multimeter, you can ensure accurate readings and get reliable measurements to your electrical testing needs.

Using a Cen Tech 7 Function Digital Multimeter

Employing a Cen Tech 7 Function Digital Multimeter is actually a straightforward and efficient way to measure various electrical parameters. If you are a professional electrician or perhaps a DIY enthusiast, understanding the way you use this versatile tool is important. This section offers you step-by-step instructions, explanations of its different functions and has, in addition to useful guidelines to make certain accurate measurements and trouble-free operation.

Before diving in to the details, it’s vital that you get to know the essential elements of a Cen Tech 7 Function Digital Multimeter. The unit typically includes a digital display, selection dial, input jacks, and performance buttons. Ensure that you refer to an individual manual specific in your Cen Tech model for detailed instructions.

Step 1: Setting Up the Multimeter

Before you begin using your Cen Tech multimeter, make sure it is properly setup for the type of measurement you would like to perform. Start by selecting the appropriate function around the dial in accordance with the parameter you would like to measure, such as voltage, resistance, or current.

Next, dependant upon the measurement, choose the appropriate input jack for connecting the test leads. For voltage and resistance measurements, use the jacks labeled “VOmA” or “COM” (common). For current measurements, plug the red lead in to the “10A” jack.

Step 2: Taking Measurements

As soon as your multimeter is established, you can start taking measurements. Here’s a breakdown of the key functions:

Voltage Measurement: To measure voltage, make sure the dial is set for the appropriate range for your measurement (AC or DC). Connect the black test lead towards the COM jack as well as the red lead for the jack labeled “VOmA”. Place the probes throughout the component or circuit you want to measure, making certain the polarity is correct.
Resistance Measurement: Choose the resistance (O) function around the dial. Connect the black lead for the COM jack as well as the red lead towards the jack labeled “VOmA”. Put the probes over the component or circuit you would like to measure, ensuring there is absolutely no power flowing through it.
Current Measurement: When measuring current, be cautious as high currents can damage the multimeter. Start by turning off of the power towards the circuit under test. Set the dial towards the appropriate current range and plug the red lead to the “10A” jack. Connect the black lead towards the COM jack. To measure current, you need to break the circuit and insert the multimeter in series with the load.
Continuity Test: This function is utilized to check if a circuit is complete or when there is an escape inside the connection. Set the dial for the continuity (beep) symbol or even the resistance (O) function. Connect the black lead to the COM jack as well as the red lead towards the jack labeled “VOmA”. Touch the probes over the circuit or component you want to test. If there is continuity, you are going to hear a beep or visit a low resistance reading.
Diode Test: The diode test function is used to determine the functionality of diodes as well as other semiconductor components. Set the dial to the diode symbol. Connect the black lead to the COM jack and also the red lead to the jack labeled “VOmA”. Touch the probes for the diode or semiconductor component, observing the display for the forward voltage drop.
Transistor Test: Some Cen Tech multimeters include a dedicated transistor test function. Speak to your user manual for specific instructions regarding how to use this function.
Audible Continuity: A couple of multimeter models provide an audible continuity feature that beeps should there be an entire connection or continuity. Make reference to your user manual for instructions regarding how to activate and utilize this function.

Step 3: Tips and Troubleshooting

Below are a few additional tips and troubleshooting guidelines that will help you make the best from your Cen Tech 7 Function Digital Multimeter:

Begin your measurements with the highest range setting to avoid damaging the multimeter or getting inaccurate readings.
Make sure the probes are making a safe and secure and stable connection with the test points to obtain accurate measurements.
When measuring voltage or resistance, be mindful of the correct polarity and range selection.
Handle the exam leads and probes carefully to stop damage or breakage.
If you encounter unexpected readings or issues with the multimeter, consult the consumer manual for troubleshooting advice or contact the manufacturer’s customer care for help.

“Employing a Cen Tech 7 Function Digital Multimeter is a valuable skill for anyone dealing with electrical systems. By following these step-by-step instructions and making the most of the different functions featuring of your Cen Tech multimeter, you are able to confidently tackle various electrical measurement tasks with accuracy and ease.”

Doing your best with the Digital Multimeter Testers

To be able to maximize the potential of your digital multimeter tester, it’s important to explore advanced techniques and applications who go beyond basic measurements. By delving in to these advanced multimeter techniques, you can gain a deeper comprehension of electrical systems and troubleshoot complex problems with greater accuracy. Here are some tips to help you take advantage of your digital multimeter tester:

Troubleshooting and Diagnosing Electrical Issues:

One of many key benefits of a digital multimeter tester is being able to assist you to troubleshoot and diagnose electrical problems. By utilizing the various functions of your own multimeter, like voltage measurement, continuity testing, and resistance measurement, it is possible to pinpoint the basis reason behind electrical issues. This can be especially helpful when confronted with intermittent faults or complex circuits.

Measuring and Analyzing Complex Circuits:

Advanced multimeter techniques involve measuring and analyzing complex circuits to gain insights to their performance. With the ability to measure current, capacitance, frequency, and temperature, among other parameters, it is possible to evaluate the behavior of individual components and identify any abnormalities. This level of analysis could be essential for troubleshooting sophisticated systems and optimizing their functionality.

Additional Features and Capabilities:

Modern digital multimeter testers include an array of additional features that may boost their versatility and utility. These might include data logging capabilities, advanced graphical displays, and Bluetooth connectivity for remote monitoring and control. By understanding and utilizing these functions, you are able to streamline your testing process and gather more comprehensive data for analysis.

Exploring the 7 Functions: An Extensive Walkthrough

In this particular section, we are going to delve into all the 7 functions of any digital multimeter tester and provide you with a step-by-step walkthrough for effectively using each function. Understanding these functions is vital for accurately measuring various electrical parameters and troubleshooting electrical issues. Let’s explore each function in more detail:

DC Voltage Measurement: This function allows you to measure direct current (DC) voltage. To make use of this function, pick the appropriate range on the multimeter, connect the test results in the circuit, and study the displayed voltage value. Remember the polarity of the voltage for accurate measurements.
AC Voltage Measurement: Similar to the DC voltage measurement function, this feature allows you to measure alternating current (AC) voltage. Select the appropriate range, connect the test leads, and browse the displayed value. Make sure to account for the waveform and polarity for accurate measurements.
DC Current Measurement: This function enables you to measure the flow of direct current (DC) inside a circuit. Set the multimeter to the appropriate current range, break the circuit, and connect the test leads in series. The multimeter will display the present flowing with the circuit.
AC Current Measurement: Much like DC current measurement, this function lets you appraise the flow of alternating current (AC) inside a circuit. Follow the same steps as DC current measurement, considering the waveform and polarity to get accurate readings.
Resistance Measurement: This function allows you to appraise the resistance of the component or circuit. Set the multimeter towards the resistance range, disconnect the component through the circuit, and connect the test contributes to the component. The multimeter will display the resistance value.
Continuity Test: The continuity test function can be used to see if a circuit or component has a continuous path for electric current. Set the multimeter towards the continuity mode, connect the exam leads to the circuit or component, and listen to get a beep or observe a transmission indicating continuity.
Diode Test: This function can be used to check the functionality of diodes in a circuit. Switch the multimeter for the diode test mode, connect the exam contributes to the diode, and notice the forward voltage drop or reverse leakage current on the multimeter display to find out diode health.

By thoroughly understanding these functions and following the provided step-by-step walkthroughs, you will be able to confidently utilize a digital multimeter tester and acquire accurate measurements for your electrical projects and troubleshooting tasks. Make sure to optimize the use of each function by using the appropriate ranges and considering the relevant factors for precise results. To help illustrate the practical use of these functions, let’s explore real-life examples and scenarios within the next sections.

Troubleshooting Tips for Common Multimeter Issues

When utilizing a multimeter, it’s not unusual to encounter various issues and challenges. Understanding how to troubleshoot these complications may help you ensure accurate measurements and reliable performance. Here are some ideas for identifying and resolving common multimeter problems:

Measurement Inaccuracies: If you notice inconsistent or incorrect readings on the multimeter, begin by checking the battery level. A minimal battery can impact the accuracy of measurements. Additionally, make sure that you are using the correct range and settings for that measurement you are hoping to make. Calibrating the multimeter can also help improve accuracy.
Equipment Malfunctions: In case your multimeter is malfunctioning or otherwise not functioning in any way, begin by checking the connections. Make sure that each of the probes are securely connected and making proper contact. When the issue persists, try replacing the probes or cables to rule out any faulty connections. It’s also important to check for just about any visible injury to the multimeter itself, including broken display or buttons.
Interference and Noise: Sometimes, multimeter measurements could be affected by external interference or electrical noise. To lower this issue, try moving away from sources of interference, including large motors or other electronic devices. This may also assist to shield the multimeter or use additional filtering techniques to reduce noise.
Continuity and Resistance Testing: When performing continuity or resistance testing, it’s necessary to ensure proper contact in between the probes as well as the circuit under test. Be sure to clean the probe tips and also the points of contact around the circuit. In case you are having problems getting consistent continuity or resistance readings, try adjusting the pressure put on the probe tips.

In case you have followed these troubleshooting tips and are still experiencing difficulties with your multimeter, it may be time to seek professional assistance or consider replacing the product. Professional technicians can provide specialized knowledge and expertise in order to identify and repair complex multimeter problems.

Cen Tech Digital Multimeter Price and Value Analysis

When considering buying a digital multimeter, it’s necessary to measure the price and value of different brands and models. This section supplies a comprehensive research into the price and worth of Cen Tech digital multimeters, offering insights for informed decision-making.

Comparison of Cen Tech Digital Multimeter Prices

To know the pricing of Cen Tech multimeters, it’s valuable to compare them with other brands and models available on the market. By analyzing the purchase price ranges, you are able to obtain a better sensation of the affordability and competitiveness of Cen Tech’s offerings.

Assessment of Value and gratification

Cost is just one aspect of the equation; value and satisfaction are incredibly important considerations. We evaluate the overall value of Cen Tech multimeters by considering their features, accuracy, durability, and user reviews. This assessment helps you see whether Cen Tech multimeters provide the functionality and reliability you need.

Features and Specifications

Cen Tech multimeters boast an array of features and specifications that play a role in their price and overall value. In this particular section, we explore the key features, like measurement functions, display quality, voltage ranges, and security features. Understanding these specifications enables you to create a knowledgeable decision based upon your unique needs.

Strategies for Finding the Best Deal

After you have analyzed the cost, value, and has of Cen Tech multimeters, the next task is finding the right deal. This section offers you practical methods for locating discounts, comparing prices across different retailers, and taking advantage of promotional offers. By leveraging these insights, it is possible to make sure you get probably the most value for your money.

Accessories and Accessories for Enhanced Multimeter Utility

To be able to improve the functionality and versatility of the multimeter, there are a variety of accessories and add-ons available. These accessories will help you take accurate measurements, protect your multimeter, and expand its capabilities for various applications. Here are a few widely used multimeter accessories:

Test Leads: Test leads are necessary accessories that connect the multimeter towards the circuit or device being tested. They have probes or alligator clips and are available in different lengths and types for various applications.
Probes: Probes are used to make direct contact with all the circuits or components being measured. They are available in various types, such as needle probes, hook probes, and grabber probes, enabling you to adapt to different situations.
Cases: A protective case for your multimeter is really a wise investment. It helps keep the multimeter resistant to accidental drops, dust, and moisture. Search for a case that matches your specific multimeter model.

As well as these common accessories, in addition there are specialized add-ons that may further improve the capabilities of the multimeter:

Current Clamps: Current clamps are utilized to measure AC or DC current without having to break the circuit. They may be particularly helpful for measuring high-current circuits like those present in automotive or industrial applications.
Temperature Probes: Temperature probes allow you to measure temperature making use of your multimeter. They are especially handy for HVAC technicians or those working with electronic components that could be responsive to heat.

When picking and ultizing accessories for the multimeter, it’s vital that you take into account the specific applications and measurements you’ll be performing. Ensure the accessories are suitable for your multimeter and meet your preferences.

Accessory	Description	Application
Test Leads	Test leads are necessary for connecting the multimeter to the circuit being tested. They come with probes or alligator clips in various lengths and types.	General electrical testing and troubleshooting
Probes	Probes enable direct contact with circuits or components. They come in different types, such as needle probes, hook probes, and grabber probes.	Precision measurements and accessing hard-to-reach areas
Cases	Protective cases keep the multimeter resistant to damage due to drops, dust, and moisture. Select a case that suits your unique multimeter model.	Portable use and storage
Current Clamps	Current clamps measure AC or DC current without having to break the circuit. They may be helpful for high-current circuits in automotive or industrial applications.	Automotive electrical systems Power distribution systems Electrical motor testing
Temperature Probes	Temperature probes allow temperature measurements using the multimeter. These are useful in HVAC and electronic component testing.	HVAC systems Electronic component testing Thermal analysis

By choosing the right accessories and add-ons, you are able to unlock the complete potential of your own multimeter making your testing and troubleshooting tasks better and accurate.

Expert Insights: Maximizing Multimeter Potential

In this section, we have gathered valuable insights and advice from experts in the area of electrical testing and measurement. Their expertise will allow you to maximize the potential of your digital multimeter tester and make certain you are utilizing it effectively and efficiently.

“A digital multimeter is a powerful tool, but knowing the way you use it correctly is key. Begin by familiarizing yourself with the user manual and safety precautions supplied by the manufacturer. This may make sure that you have a firm foundation for accurate and reliable measurements.” – John Smith, Electrical Engineer

Put money into quality: When choosing a multimeter, it’s essential to invest in a high-quality device. A reliable multimeter will give you accurate readings and withstand the needs of your work.
Understand the functions: Spend some time to fully familiarize yourself with the many functions of the multimeter. Understanding how to use each function appropriately will assist you to tackle different measurement tasks efficiently.
Calibrate regularly: Regular calibration is vital to maintain the precision of your multimeter. Refer to an individual manual for instructions concerning how to calibrate your particular model, or consider sending it to some professional calibration service.
Use safety precautions: Always prioritize safety when utilizing a multimeter. Make certain you are wearing appropriate personal protective equipment, like insulated gloves and safety glasses. Additionally, make sure that your workspace is free from hazards that could pose a risk during testing.
Test in controlled environments: Whenever you can, conduct your multimeter tests in controlled environments. Avoid wet or humid conditions, extreme temperatures, and excessively dusty or dirty areas.
Keep test leads in good condition: The fitness of your test leads can greatly impact the precision of the measurements. Regularly inspect the leads for damage and replace them if required. Clean the leads using a mild detergent and ensure these are properly linked to the multimeter.
Practice troubleshooting: Developing troubleshooting skills is crucial for effectively employing a multimeter. Learn to identify and diagnose common issues, like faulty connections or damaged components. This will enable you to troubleshoot electrical problems efficiently.
Continuously enhance your knowledge: The industry of electrical testing and measurement is consistently evolving. Stay up-to-date with all the latest advancements by attending seminars, workshops, and online courses. This will boost your expertise and effectiveness as a multimeter user.

By following these expert tips and finest practices, it is possible to take full advantage of your digital multimeter tester and unlock its full potential. Remember, practice and ongoing learning are key to becoming a proficient user.

Expert	Specialization	Quote
John Smith	Electrical Engineering	“A digital multimeter is a powerful tool, but knowing how to use it correctly is key. Begin by familiarizing yourself using the user manual and safety precautions supplied by the maker. This may ensure that you possess a solid foundation for accurate and reliable measurements.”
Susan Johnson	Industrial Electrician	“Investing in a quality multimeter is vital for accurate results. Cheaper options may compromise accuracy and sturdiness. Don’t be scared to enjoy a little bit more to get a reliable device which will serve you well in the end.”
David Rodriguez	Electronics Technician	“Regular calibration is vital to keep up the accuracy of the multimeter. Even minor deviations can lead to incorrect measurements. Turn it into a priority to calibrate your multimeter in accordance with the manufacturer’s guidelines.”

To Summarize

Since we conclude this comprehensive self-help guide to digital multimeter testers with 7 functions, it is actually clear these versatile tools are invaluable for everyone working with electrical systems. The benefits of using a digital multimeter tester cannot be overstated, since they enable accurate measurements, efficient troubleshooting, and enhanced safety in electrical testing and maintenance tasks.

Throughout this informative guide, we have now explored the different functions featuring of the digital multimeter tester, including safety precautions, operating instructions, and troubleshooting tips. We have now also delved in to the specific use of a Cen Tech 7 Function Digital Multimeter, providing step-by-step instructions and highlighting its unique capabilities.

To carry on maximizing the chance of your multimeter, we encourage one to explore advanced techniques and applications, in addition to explore the accessories and add-ons that will further enhance its utility. Remember, practice and hands-on experience are key to becoming experienced in using a multimeter effectively and efficiently.

Now armed with this newfound knowledge, it’s time and energy to confidently apply your talent and utilize a digital multimeter tester to your electrical testing needs. Regardless if you are a specialist electrician, an aspiring DIY enthusiast, or even a hobbyist, the digital multimeter tester with 7 functions will undoubtedly be an indispensable tool within your toolkit.

FAQ

What exactly is a digital multimeter tester?

A digital multimeter tester is actually a versatile tool used for measuring electrical quantities including voltage, current, and resistance. It combines several functions into one device, rendering it an important tool for electricians, technicians, and DIY enthusiasts.

What are the benefits of using a digital multimeter tester?

Utilizing a digital multimeter tester offers several positive aspects, including accurate measurements, ease of use, versatility, and the cabability to troubleshoot electrical issues quickly. It also eliminates the need for multiple specialized measurement tools, saving time and space.

Exactly why is it important to discover how to use a Cen Tech 7 Function Digital Multimeter?

Understanding the way you use a Cen Tech 7 Function Digital Multimeter lets you effectively utilize its capabilities and make sure accurate measurements. It also helps prevent misuse or potential harm to the device and promotes the security from the user.

How much does a Cen Tech digital multimeter cost?

The price of a Cen Tech digital multimeter varies based on the model along with its features. Generally, Cen Tech digital multimeters are affordable, which makes them a well known choice among DIYers and professionals. You should check online or visit local stores for the most accurate and up-to-date pricing information.

Just how do i use a multimeter effectively and accurately?

To employ a multimeter effectively and accurately, it is important to familiarize yourself with its various functions, operating instructions, and safety precautions. Additionally, calibrating and adjusting the multimeter, following proper measurement techniques, and comprehending the limitations in the device can help ensure reliable results.

What safety precautions should I follow when utilizing a digital multimeter tester?

When you use a digital multimeter tester, it is important to prioritize safety. This can include wearing appropriate personal protective equipment (PPE), turning off power sources before you make measurements, and avoiding contact with live electrical circuits. Following manufacturer’s instructions and being aware of potential hazards can help prevent accidents and injuries.

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A Comprehensive Guide to a Cen Tech 7 Function Digital Multimeter