Now you know with a flick of the wrist - whether in the wall socket, at the ceiling connection or in the fuse box: You can see immediately whether there is voltage present and thus whether current is flowing! Make sure that the power is actually switched off and that you can touch cables without danger.
For direct and non-contact testing: test the voltage in two simple ways. via direct contact of the shaft, e.g. with the socket. Or also by induction, e.g. on a cable.
Practical screwdriver with clip: Thanks to the shape of the shaft, you always have a slotted screwdriver at hand. And with the retaining clip always with you, on your pocket or belt.
