Professional AC clamp meters 600A TRMS, CAT IV 600V The professional clamp meters HT9012 are designed for measuring AC current up to 600 A and AC/DC voltage up to 1000 V, complying with CAT IV 600 V and CAT III 1000 V standards according to IEC/EN61010-1. Features a wide backlit display, 6000 measurement points, and an auto-off function to conserve battery life.