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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.
Polygon-
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.
Sam_w
Maybe with older ones but these days the unit will calibrate itself after it powers on making them very accurate (unless the calibration system breaks).
For 5m you will get away with using a small level you don't necessarily need a detector. Some levels come with what looks like a reflector that lets you pick up the line from a good distance in even bright sunshine other will come with coloured specs that allow you to see the line better.