Amprobe’s ACDC-3400 IND Digital Clamp-On Multimeter is CAT IV 600V / CAT III 1000V rated for industrial applications and utilities. CAT IV rating is required for any application where the electrical wiring is located outside of the building, connecting electrical system to the power transformer. Includes True RMS (TRMS) sensing for accuracy and dependability. Large jaw accommodates wires up to 2" in diameter.