AC Current Clamp, Dual Range: 40A and 400A The Agilent (now Keysight) U1583B is an AC Current Clamp designed to enables taking current readings without breaking the circuit being measured. Dual range: 40 A and 400 A 10 mV/A and 1 mV/A Output CAT III 600 V overvoltage protection (OVP) BNC to banana plug provided for use with digital multimeters Useable with Agilent (now Keysight) handheld digital multimeters and handheld oscilloscopes