10 Best True Rms Multimeters 2025 in the United States

The Klein Tools MM420 is a solid choice for anyone needing a reliable true-RMS multimeter that covers a broad range of measurements. It handles AC/DC voltage up to 600V and current up to 10A, which is suitable for most household and light professional electrical work. Its 50 MΩ resistance range and additional features like temperature, capacitance, frequency, and diode testing add good versatility. The auto-ranging and true RMS technology help ensure measurements are accurate, especially when dealing with complex signals.

The Lead-Alert feature is a nice safety touch, letting you know if the test leads aren’t properly connected, which can prevent mistakes. The backlit LCD and convenient hands-free options like the kickstand and magnetic hanger make it easier to use in dim or awkward spaces. This multimeter suits DIYers, electricians, and technicians who want an easy-to-use, accurate tool for everyday electrical tasks without overcomplication.

The Fluke 117/323 Kit is a versatile combo kit designed for residential and commercial electricians. It includes the 117 multimeter and the 323 clamp meter, both of which offer true RMS measurements. This is especially beneficial for achieving accurate readings on non-linear loads, a common scenario in many electrical systems. The 117 multimeter is notable for its low input impedance, which helps to prevent false readings caused by ghost voltage—a frequent issue in environments with multiple electrical signals.

The 323 clamp meter can handle up to 400 A of AC current and measure up to 600 V for both AC and DC, making it a robust tool for various electrical applications. However, while the kit is highly functional, it is somewhat heavier at 0.8 kilograms, which may not be ideal for extended use in the field. Additionally, both devices are battery-powered, which is convenient but also means you'll need to keep spare batteries handy.

The kit includes test leads, a TPAK, and a carrying case, adding value through these useful accessories. The Fluke brand is well-regarded for reliability and safety, making this kit a solid choice for professionals needing precise and dependable measurements in their work.

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.