Do you really know the circuit is dead?

摘要

Nothing is more dangerous than trusting a defective voltage indicator. The proving unit is one of the few designs to check indicators with ranges above 250V. It can also check Drummond and other filament test lamps as its output is sufficient to illuminate the bulb. The Martindale PD690 is designed for indicators with 230V and 415/440V AC or DC detection ranges, such as the Martindale VI13700G.