The Triplett CM24-NIST True-RMS Mini Clamp Meter can measure AC and DC current to up 400A without breaking the circuit by clamping around a single conductor. This saves time and the circuit will not be damaged. True-RMS provides better accuracy when measuring non-sinusoidal or noisy waveforms. Measurements can read on the 4000 count backlit LCD. It has an Inrush current function that captures the instantaneous surge (inrush) current when power equipment is turned on. Additional features include: a built-in NCV detector with LED, DC zero function, overrange indication, and Auto power off. Data Hold freezes the display for easy viewing. CAT III-300V safety category.