The HT100 TRMS clamp meter with open jaws measures AC currents up to 200 A. It features automatic function recognition and measures AC current up to 200 A, AC/DC voltage up to 1000 V in RMS mode, meeting CAT IV 600 V and CAT III 1000 V standards per IEC/EN61010-1. The open-jaw design allows current measurement without circuit interruption. It has a wide display with 9999 counts, Voltsense phase detector, data hold, and backlight for easy reading in low-light conditions. It can also measure resistance, check circuit continuity, and test diodes. It includes an auto-off feature to conserve battery life.