Measure voltage up to 600V ac through the open fork, without test lead contact to live voltage.+ Without opening covers or removing wire nuts. On wires up to AWG 4/0 (120 mm2), carrying as much as 200 A. It will change your job. Safer. Faster. Easier.Product Highlights� FieldSense technology for ac voltage, current and frequency measurement without making electrical contact to live voltage+�600 V ac or dc (T6-600)� 0.1 to 200 A ac� Resistance 1 ? to 100 k? (T6-1000), 1 ? to 2 k? (T6-600)� Frequency measurement 45 Hz to 66 Hz (T6-1000)� Works with wires up to AWG 4/0 (120 mm2) with a 17.8 mm jaw opening.� HOLD button temporarily freezes the reading for easy viewing� Easy to read display with backlight� Accepts optional Fluke TPAK Magnetic Meter Hanger for convenient operation