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