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I bought a cheap rotary level from eBay, imported from Poland, its red rather than green, but has been completely flawless. We tested it against a Leica, and it was pretty much spot on. Has been used to build a massive deck, and three barns, as well as laying loads of pipes. Been borrowed by a couple of builder friends who were impressed enough to then buy them themselves.
So the level itself beeps (or something) once it receives the reflected beam? That sounds cheaper than buying a detector I'll only use once. I'll keep shopping I think, thanks again.