Detect live voltage, see voltage level, even with dead batteries 3 forms of AC/DC voltage indication: light, sound, and vibration Backlit LCD display and hold function for easier viewing Helps electricians and technicians work safer by indicating the presence of voltage, even when the batteries are dead Additional functionality, such as a GFCI trip, easy to read LCD screen, resistance measurement up to 9.99 kΩ, and a built-in flashlight make the T+Pro the first voltage tester that electricians reach for The user will be alerted to the presence of voltage in dark or noisy environments with the light and vibration notifications The audible indication can be optionally disabled at the push of a button The tester also has a built-in flashlight for highlighting the point of measurement Features a rotary field indicator and has convenient probe storage on the back Specifications Voltage Detection: 12 V - 600 V Alert Type: Light & Sound Additional Specifications Operating Temperature: -10°C to 55°C (14°F to 131°F) Storage Temperature: -30°C to 60°C (-22°F to 140°F) Operating Altitude: 2,000 m (approx. 6,561.6 ft) Storage Altitude: 10,000 m (approx. 32,808.4 ft) Battery Type: 10,000 m (approx. 32,808.4 ft) Battery Life: 40 hrs. Standard(s) Met: ISA-82.02.01 (IEC 61010-1 Mod) Second Edition, CAN/CSA-C22.2 No. 61010-1 Second Edition, IEC 61010 - 1 to 1000 V CAT III/600 V CAT IV, Compliance to NFPA 70E, CSA approved LED Voltage Indication Levels: 12 V, 24 V, 48 V, 120 V, 208 V, 240 V, 277 V, 480 V, 600 V GFCI Test Current: 100 V - 150 V @ 6 mA - 9 mA AC, 150 V - 240 V < 12 mA