The FLIR CM4X-NIST Clamp Meter Family includes three professional and affordable True RMS meters designed to meet the needs of commercial and residential electricians: the CM42-NIST AC clamp meter, the CM44-NIST AC clamp meter with Type K thermocouple, and the CM46-NIST AC/DC clamp meter with Type K thermocouple. Featuring Accu-Tip™ technology, taking amperage measurements on smaller-gauged wires can be done more accurately than ever – to a tenth of a digit! Comes with certificate traceable to NIST.