A portable, pocket-sized, battery-powered proving unit. Able to source stable AC and DC voltages for both LoZ and HiZ instruments. Reduces the risk of shock and arc flash by validating the functionality of test tools using a single LED. A simple-to-use solution for complying with TBT verification. Voltage is sourced through recessed contacts that are activated when tested probes are inserted to avoid accidental contact. Compatible with both high impedance and low impedance multimeters, clamp meters or two-pole testers. Long battery life of 5,000 tests per set of 4 x AA batteries. Includes TPAK magnetic hanging strip. 50-240V Output Voltage LED Indicator 5000 Tests per Set of Batteries Includes TPAK Magnetic Hanging Strap 50-240V Output Voltage LED Indicator 5000 Tests per Set of Batteries Includes TPAK Magnetic Hanging Strap