1000A TRMS AC/DC Clamp with 3000A AC Flex Clamp - (CM3000)The Triplett Model CM3000 NIST 1000A True RMS AC DC Clamp Meter with Certificate of Traceability to N. I. S. T. can measure AC DC current up to 1000A without breaking the circuit by clamping around a single conductor. This saves time and the circuit will not be damaged. It also comes with a 3000A AC Flex Clamp for measuring high current (1. 5 to 3000A) in tight spaces. True RMS provides better accuracy when measuring non sinusoidal or noisy waveforms.