10 Best True Rms Multimeters 2026 in the United States

The Fluke 87V Max True-RMS Multimeter is a tough, reliable tool designed for professionals working in demanding environments. It stands out with its rugged design—able to survive drops from up to 13 feet and sealed inside a waterproof and dustproof IP67 case, making it great for outdoor or industrial use. Its safety ratings (CAT III 1000 V and CAT IV 600 V) mean it can handle high-voltage measurements safely, which is important if you're working with electrical panels or solar systems. The included MC4 test leads are specifically made for measuring photovoltaic arrays, which adds extra value for solar technicians.

This model is known for precise True-RMS readings, ensuring you get reliable voltage and current measurements even with complex signals. The meter is powered via corded electric, so it’s always ready without worrying about batteries.

It is well suited for electricians, HVAC technicians, and solar professionals who need a durable, safe, and versatile meter that performs well in rough conditions. Its bulkier size might be less convenient for casual users looking for a compact tool, and the price is generally higher compared to basic models due to these advanced features. For those who require precision, safety, and ruggedness, the Fluke 87V Max is a strong candidate.

The Klein Tools ET600 is a solid choice for those needing a true RMS multimeter with insulation testing capabilities. It stands out by offering insulation resistance testing up to 4000 MΩ at multiple voltage levels (125V, 250V, 500V, and 1000V), making it useful for thorough electrical diagnostics and safety checks. This model supports measurements up to 1000V AC/DC and includes resistance and continuity testing, covering a wide range of common electrical tasks.

The automatic ranging feature simplifies usage, and true RMS technology improves measurement accuracy, especially with non-linear loads. The backlit display with a bar graph and helpful icons like max/min, hold, and low battery indicators enhance usability and readability, even in dim environments. Additionally, the built-in voltage detection with an alarm and high voltage icon is a valuable safety feature.

On the downside, it requires 6 AA batteries, which could be bulkier and less convenient than models using rechargeable batteries. The size and weight are moderate, which might be less pocket-friendly for some users. This meter is well suited for electricians, technicians, and serious DIYers who want a reliable multimeter that also tests insulation resistance, but casual users might find it a bit more advanced or bulky than necessary.

The Fluke 117 Digital Multimeter is a reliable tool for both professionals and DIY enthusiasts. One of its standout features is the VoltAlert technology, which allows for non-contact voltage detection, adding a layer of safety and convenience. The AutoVolt automatic AC/DC voltage selection simplifies the measurement process by automatically identifying the type of voltage you're working with. Additionally, the low input impedance helps to prevent false readings due to ghost voltage, which can be a common issue in some environments.

The True RMS capability ensures accurate readings even on non-linear loads, making it versatile for various applications. For those who often work in dim environments, the large white LED backlight is a valuable addition, enhancing visibility. The multimeter also measures resistance, continuity, frequency, and capacitance, and records minimum, maximum, and average readings for comprehensive data analysis. In terms of accuracy, it boasts an impressive +/-0.5%, which is quite satisfactory for most electrical tasks.

The battery life is impressive, lasting up to 400 hours without the backlight, which reduces the need for frequent replacements. However, it’s important to note the unit’s weight of 550 grams might be a bit heavy for prolonged handheld use, and its physical dimensions are relatively large, which could be a consideration for portability. Also, while the device has a solid safety rating and comes with a 3-year warranty, it might be priced higher than some other multimeters on the market, which could be a drawback for those on a tight budget. In essence, the Fluke 117 is a robust and feature-rich multimeter that excels in accuracy and ease of use, though it might not be the most portable or budget-friendly option available.