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That option is actually worse than a testing screwdriver or multimeter in some cases. They have their uses but they're definitely not for testing conductors you're about to handle.
As an example you don't use one of those in the entire electrical installation course because they don't meet the standard for a voltage tester.
Airhead
aggi
I have a similar but more basic/cheaper tester
https://www.amazon.co.uk/dp/B07TKXT1V6/?th=1
I don't do a great deal of electrical stuff and I'm reasonably confident in my house wiring (had a full rewire a few years back) but I figured it's not an area to take a risk and also means I can do stuff with just turning the appropriate breaker off rather than turning the power to the whole house off.