Best True RMS Multimeters of 2026
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True RMS multimeters are electronic devices that are widely used by electricians, engineers, and technicians to measure electrical signals accurately. These devices can measure both AC and DC signals and provide accurate readings even for non-sinusoidal waveforms. Unlike average responding multimeters, true RMS multimeters can accurately measure signals with harmonic distortions, making them an essential tool for troubleshooting complex electrical systems. They are available in different models and sizes, ranging from handheld devices to benchtop units, and come with various features such as data logging, Bluetooth connectivity, and high-resolution displays for easy reading. Overall, true RMS multimeters are a reliable and versatile tool for anyone working with electrical systems.
At a Glance: Our Top Picks
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9.8
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9.7
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9.5
Top 4 True RMS Multimeters
AstroAI Digital Multimeter
The AstroAI Digital Multimeter is a versatile and professional-level tester that accurately measures AC/DC Current, AC/DC Voltage, Capacitance, Frequency, Duty Cycle, Resistance, Diode, Continuity and Temperature. It also features Auto-Ranging capability, True RMS for measuring both AC Current and Voltage, Data Hold, Large LCD Backlit Screen, Auto Shut-off, Hanging Magnet, and Kickstand. This device is suitable for a variety of automotive and household electrical problems, ensuring safety with double ceramic fuses to protect from overloading. Additionally, it comes with lifetime technical support and Amazon's superior delivery.
Fluke 117 Digital Multimeter with Non-Contact Voltage Detection
The Fluke 117 Digital Multimeter is a versatile tool with VoltAlert technology that allows for non-contact voltage detection. It also features AutoVolt automatic AC/DC voltage selection, low input impedance to prevent false readings, a large LED backlight for working in poorly lit areas, and True RMS for accurate measurements on non-linear loads. With a battery life of up to 400 hours, this multimeter is a reliable choice for measuring resistance, continuity, frequency, and capacitance.
Fieldpiece SC260 Compact HVACR True RMS Clamp Meter
Fieldpiece Compact HVACR Clamp Multimeter SC260 is a durable and compact device designed for electrical HVACR service in hot and cold environment. It offers non-contact voltage and amperage readings, continuity warning, diode test, and auto-select mode. The sturdy swivel magnet allows for hands-free measurements, while its higher accuracy VAC and AAC readings, True RMS, temperature, capacitance and backlight make it a reliable device.
Fluke 115 Digital Multimeter
The Fluke 115 Digital Multimeter is a versatile tool for measuring AC/DC voltage up to 600V, resistance, continuity, frequency, and capacitance. It features true-rms for accurate measurements on non-linear loads and is safety rated. The large white LED backlight allows you to work in poorly lit areas, and it can measure 20A (30 seconds momentary; 10A continuous). It is also CAT III 600V safety rated and has an operating temperature of -10°C to +50°C and storage temperature of -40°C to +60°C. With the ability to check continuity, frequency, capacitance, and diode test, this multimeter is a must-have for professionals.
Frequently Asked Questions (FAQs)
1. Is true RMS worth it?
Yes, true RMS measurement is necessary for accurate voltage measurement. Since the voltage of an AC signal varies over time, its effective voltage can only be calculated using RMS or True RMS measurement. True RMS multimeters provide accurate readings of AC signals, making them worth the investment.
2. Is true RMS needed for DC?
No, true RMS is not needed for DC measurements. The RMS value of a pure DC voltage is equal to its DC value. Most multimeters are AC coupled, so if a signal has both DC and AC components, the multimeter will only display the RMS value of the AC part.
3. Is RMS more accurate than average?
RMS and average are used for different purposes in power calculations. The RMS value of voltage and/or current is used to calculate average power accurately. Calculating the RMS value of the AC power waveform directly is not physically meaningful.
4. What is the main disadvantage of a true RMS?
The main disadvantage of a true RMS responding voltmeter is its inability to accurately measure non-linear voltage and current characteristics, such as those found in thermocouples. This limitation is a drawback of true RMS meters.
5. Why is a true RMS meter desirable?
A true RMS meter is desirable because it can accurately measure both sinusoidal and non-sinusoidal AC waveforms. This makes it suitable for measuring distorted waveforms caused by nonlinear loads like variable speed drives or computers.
6. What is the advantage of a true RMS multimeter?
A true RMS multimeter offers the advantage of accurately measuring both pure sinusoidal waves and complex non-sinusoidal waves. It can handle distorted waveforms caused by nonlinear loads, providing more accurate measurements compared to averaging meters.
During our true rms multimeter research, we found 24 true rms multimeter products and shortlisted 4 quality products. We collected and analyzed 292,914 customer reviews through our big data system to write the true rms multimeters list. We found that most customers choose true rms multimeters with an average price of $69.89.
The true rms multimeters are available for purchase. We have researched hundreds of brands and picked the top brands of true rms multimeters, including AstroAI, Fluke, Fieldpiece. The seller of top 1 product has received honest feedback from 6,643 consumers with an average rating of 4.9.
Harry Stack owns a small hardware store, his career landed him a depth of knowledge in categories such as tools, equipment, machinery and hardware. In his spare time, he usually repairs furniture, safes and appliances, and he knows how to make simple repairs to plumbing or electrical fixtures. His hobbies also include woodworking and fishing.