Or you could rock it properly old skool with a neon mains tester for £1.99.
They’re banned on most sites for a reason ;) And for similar reasons I didn’t recommend a noncontact voltage detector.
They have their issues, I know! I still use mine though when I get bored of hunting down my multimeter, or it's run out of batteries again. Haven't been electrocuted yet. Well, not by the neon tester, anyway.
@Nef started
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Or you could rock it properly old skool with a neon mains tester for £1.99.