Pen-style switch cabinet wrench with fastening clip With ON / OFF button, can be used to detect AC voltages from 50 to 600 V / 50 to 60 Hz without contact via the LED display Plastic body, wrench profile made from die-cast zinc 1/4 " hexagon bit attachment on both sides, one of them magnetic Swivelling wrench carrier for using various different profiles For switch cabinets, locking systems, gas and water supply systems, heating systems, ventilation and air conditioning systems Can also be used as a door / window handle Supplied with 2 LR44 button cell batteries