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Battery operated indicator screwdriver
To do this, you need to clamp the metal contact, and touch the de-energized wire with a sting. With your other hand, you need to touch the second end of this wire. In the event of a break, the indicator will not show anything, and with a whole wire, the LED will light up. So you can check any wires.
Why does the indicator screwdriver glow by hand?
The indicator may glow due to improper connection of lighting fixtures and a chandelier. If you pass the neutral wire through the switch, and the phase wire is powered by the contacts of the light bulb, then it will not work. The indicator will show the presence of voltage at both terminals in the cartridge.