10 Best Clamp Meters 2025 in the United States

The AstroAI Digital Clamp Meter is a versatile and user-friendly tool designed for both household and industrial electrical tasks. It measures AC and DC current and voltage, along with resistance, capacitance, frequency, and more, making it useful for a wide range of troubleshooting and testing needs. Its True RMS capability ensures more accurate readings, especially in environments with complex electrical signals. The jaw opening is slim and compact, allowing it to fit comfortably around conductors in tight spaces. The meter features a clear backlit LCD screen and a built-in flashlight, improving readability in dimly lit areas.

Non-contact voltage detection with audible and visual alerts adds a layer of safety and convenience when checking for live wires without touching them. It also includes useful extras like data hold, max/min recording, and auto power-off to save battery life. Safety-wise, it meets overvoltage category III 600V standards and pollution degree 2, making it reasonably safe for most common electrical environments. However, it requires 2 AAA batteries, which may need frequent replacement depending on use.

While it offers a broad range of measurements, users must remember to clamp only around single conductors for current readings and avoid measuring voltage by clamping. This meter’s combination of features, ease of use, and safety certifications make it a solid choice for DIYers, electricians, and technicians who need a dependable and affordable clamp meter for everyday electrical testing.

The UEi DL389B is a versatile clamp meter well-suited for industrial and HVAC professionals who need a reliable tool for a wide range of electrical measurements. It measures both AC and DC currents and voltages, including very small microamps, which is helpful for detailed diagnostics. The True RMS feature ensures accurate readings even with complex electrical loads, an important advantage over basic models. Safety is strong with CAT IV 300V and CAT III 600V ratings, meaning it can be used safely in demanding environments.

The meter’s compact, lightweight design and included magnetic mount make it convenient to handle and use hands-free. The dual backlit display is easy to read, and extra features like a work light and non-contact voltage detection add useful functionality. It also covers many additional tests such as frequency, capacitance, resistance, temperature, and diode tests, making it a very flexible instrument.

While this meter covers many functions, the exact jaw opening size is not provided, which can limit use on larger cables. It is powered by AAA batteries rather than rechargeable options, which could be less convenient for frequent use. This clamp meter is a solid choice for professionals needing accurate, safe, and multi-functional measurement capabilities, though those working with very large cables might want to verify the jaw size before buying.

The Klein Tools CL810 Pro Digital Clamp Meter is designed to provide precise and reliable measurements for various electrical applications. It supports both AC and DC measurements with a 600A range, making it versatile for different tasks. The True RMS technology ensures accuracy even with complex signals, while the LoZ mode helps in identifying ghost voltage. The jaw opening size is suitable for standard applications, enhancing its practicality for professional use.

The transflective reverse-contrast display and illuminated dial significantly improve readability in low-light conditions, complemented by a built-in worklight for dark spaces. This meter also features non-contact voltage detection, providing additional safety during operations. It includes various functions such as temperature measurement, diode testing, and capacitance, adding to its versatility. The clamp meter comes with a comprehensive package, including CAT III/CAT IV safety caps for enhanced protection, which is essential for safety compliance.

Being battery-powered, users must ensure they have spare AAA batteries on hand. Its robust design with 6.6-foot drop protection and IP40 ingress protection makes it durable for tough environments. At 0.81 pounds, it is lightweight and portable, making it convenient for on-the-go tasks. Although some users might find the additional features like the mount for an optional magnetic attachment less necessary, this clamp meter is ideal for electricians, HVAC technicians, and other professionals who need a reliable and easy-to-read tool for their electrical measurements.