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stevo_com-
Everyone seems to have their own favourites and they all have pros and cons but I carry a version of these and like them a lot.
They come in different finishes and handles but also some are sprung with a lock some unsprung. I use a sprung version. The ones I've linked to are the sprung version i.e. they spring open when not locked to make it easier to use them one handed.
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Knipex is the usual goto, isn't it?[Edit] Late to the party
Airhead
NotThamesWater
Seems like you are a bit out of your depth.
You shouldn't be trying stuff with the circuits live, mains tester screwdrivers are the first thing they will tell you to throw away on a electrical course.
As you've lost track of what you have in the ceiling you need to test the circuits with the power off so you need a proper rated voltage tester that has a continuity tester integrated. There are other ways like a battery and light bulb but you need a proper voltage tester anyway if you plan on lasting in your new hobby.
Switch of the power to the circuits you are working on. Test that the power is off. Take the switch off the wall and connect the 2 wires together. Now find out which of the two wires in the ceiling have continuity when these are connected. Once you have established which wire is the switch line you should be good to go since the other 2 are loop in and loop out.
For you own safety please stop fiddling about with live circuits equipped only with a voltage testing screwdriver. Electricians are not especially patient but the living ones have a respect for electricity and only the experienced ones are working on live circuits.
Google the mains testers to see why you don't want to use your finger to provide the path to earth for 240v.
I use one of these Martindale, they are not the greatest but they're quite cheap considering an alternative possibility is death by electrocution.
https://www.electricaldirect.co.uk/product/martindale-vt12-voltage-indicator-198684?vat=1&pr=1&gclid=CjwKCAiAl-6PBhBCEiwAc2GOVOGAphvPgKyzwZx_AV27nusdX0yk7G8k7YRPpHrXTiYTCo4z-iyavhoCHfsQAvD_BwE