That fluke tester looks nothing like a screwdriver and would be tricky if attempting to use it to tighten up a screw terminal.
I personally prefer the magic wands used to sense live wires and terminals by proximity.
However, as Dave states there is always an element of risk and as electricians we are purposely aware of the dangers such cheap neon screwdrivers from places like Poundland.
That fluke tester looks nothing like a screwdriver and would be tricky if attempting to use it to tighten up a screw terminal.
I personally prefer the magic wands used to sense live wires and terminals by proximity.
However, as Dave states there is always an element of risk and as electricians we are purposely aware of the dangers such cheap neon screwdrivers from places like Poundland.