Electrical phase tester screwdriver
Has built in Neon light to indicate power.
Magnifying window in handle ensures an excellent view of the illuminated display
Following information supplied by manufacturer :
The voltage indicator is suitable for testing AC voltages from 100 up to 250 V against earth.
The metal part on top of the indicator must be touched to operate it and the earthing position of the user largely determines whether it lights up or not.
Note : Failure to light up therefore does not indicate with certainty that no voltage is present !