FieldSense technology for ac voltage, current and frequency measurement without making electrical contact to live voltage* Be faster: No need to open covers or remove wire nuts Be more efficient: Simultaneously measure voltage and current Be everywhere: 17.8 mm open fork is widest in the industry; measure up to 200 A on 4/0 wires (120 mm2) See voltage or current display " shows all power supply measurements at a glance for efficient trouble shooting 1 to 600 V ac or dc (T6-600) 0 to 200 A ac Be safer: Measure voltage to 600 V ac through the open fork, without test leads