Flir CM44 600V 400A AC Digital TRMS Clamp Meter Commercial Grade is designed to measure up to 400A AC and 600V AC/DC and features Flir’s innovative Accu-Tip design that helps improve amperage measurements on smaller gauged wires. The Flir CM44 also features a bright backlit display, frequency measurements, diodes measurements, resistance measurements, MIN/MAX/AVG recording, and more.