10 Best Clamp Meters 2025 in the United States

The Fluke 323 Clamp Meter is an excellent choice for both commercial and residential electricians seeking a reliable tool for measuring electrical parameters. It effectively measures AC current up to 400 amps and AC/DC voltage up to 600 volts, making it versatile for various applications. One of its key strengths is the true RMS capability, which ensures accurate readings even with non-linear loads. This is particularly useful in real-world scenarios where waveforms can vary significantly. The jaw opening size, which accommodates conductors up to 30 millimeters, allows for easy measurement without the need to interrupt or touch the circuit, enhancing safety and convenience.

While the Fluke 323 is strong in many areas, it does have limitations. Notably, it does not measure DC current, which may be a drawback for users needing this function. The resistance measurement capabilities are decent, with an accuracy of 1.0% ± 5 digits, but this may not suffice for highly precise applications. The audible continuity sensor is a handy feature, but users should be aware that it may not replace detailed troubleshooting in complex electrical systems.

In terms of safety, the device meets IEC safety standards and is rated for CAT IV installations up to 300V and CAT III up to 600V, making it suitable for high-voltage environments. The lightweight design, weighing just 200 grams, enhances portability, and the included carrying case adds to the convenience. This clamp meter is ideal for electricians and technicians who need a straightforward, dependable tool for basic measurements without the bells and whistles. However, if your work frequently involves DC current measurements or requires high precision in resistance readings, you might want to explore other options.

The Fluke 378FC AC/DC TRMS Non-Contact Voltage Wireless Clamp is a solid choice for both professionals and DIY enthusiasts who require reliable and versatile electrical measurement tools. One of its standout features is the FieldSense technology, which allows users to measure voltage and current without needing to make direct contact with live wires. This not only enhances safety but also makes testing quicker and more efficient, especially in potentially hazardous environments. Furthermore, it provides true RMS measurements, ensuring accuracy when dealing with non-linear loads, which is crucial for diagnosing electrical systems accurately.

The clamp's capability to perform complete 3-phase voltage and current tests helps streamline the process, reducing the number of steps needed to gather essential readings. Additionally, the power quality indicator is a valuable feature, alerting users to any issues with the equipment or power line, thus facilitating proactive maintenance.

The display is generally user-friendly, but depending on the lighting conditions, visibility might be an issue for some users, especially in bright sunlight or dim settings. The Fluke 378FC is a feature-rich clamp meter that excels in safety and accuracy, making it suitable for various electrical testing applications.