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Seems like a rotatory is only as accurate as the bubble levels on the side, which is probably enough for most cases
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.
Bobbo
Polygon
Cheers, yes that's what I'd gleaned from reading about, but it sounds like you'll need the detector outdoors over more than few metres anyway so probably not worth the extra. Thinking about it, how much more expensive can green diodes be than red, so definitely marketing at work.
There's a 2nd hand rotatory on ebay but I think given that overall I'm likely to get more use inside and my deck project is only about 5m long, self levelling might be the way to go. Seems like a rotatory is only as accurate as the bubble levels on the side, which is probably enough for most cases.