Extech CA3018 CAT IV 3000A AC Portable Flex Clamp-on Adaptor is designed to expand most multimeter’s capabilities to measure AC current up to 3000A with an 18" flexible clamp jaw that easily wraps around bus bars and cable bundles. The Extech CA3018 features a 7.5mm cable diameter for tight spaces, 3 AC current measurement ranges, easy “twist to open and lock” jaw clamp, battery level indication, and more.