The Amprobe Q20B current clamp probe measures AC or DC current without touching or interrupting the circuit. The clamp has two jaws that fit around a 1.0" (20 mm) conductor to convert a high-current signal to a low-level millivolt signal so it can be read by a testing device. Three precision dual range current clamps (20 A/120 A) for secondary current transformer applications.... GFUVE Set of 3 20 A/120 A Current Clamps Expand the capabilities of the GFUVE GF438II and GF312V2 Series Loggers with the dual-range 20 A/120 A