John, These things are a bit variable and you get what you pay for. The top notch ones that cost hundreds have a mirror that floats and finds its own level. This reflects the laser light to give a true horizontal line. These are good and is possibly what Olly has. The other extreme are a laser pointer on a tripod which itself has to be manually levelled and the pointer swung round whilst an assistant marks the wall. I bought a cheapy off ebay a few years back for a job and it was useless.
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The slightest knock or error gets magnified by the distance. I was also wanting to use it outdoors and the laser was not powerful enough.
I don't know about the lidl one specifically but I suspect it might belong in the chocolate teapot category. You could ask on usenet newsgroups UK.d-i-y In amongst the usual daft replies you tend to get a few gems.
Happy New Year and good luck with your Operation! These things are a bit variable and you get what you pay for. The man is soooo right.
But even a cheap simple device to strike a straight line is really useful when locating counters, kitchen units, etc. But they fundamentally do little more than you'll achieve with a chalk line and plumb bob. And the 300 or 400mm spirit level is too short to allow you to strike a datum line round a kitchen or bedroom without checking it with a decent 6 foot joiners level. Self-levellers (laser levels) are the way to go, but even a half decent one like the DW087K that my oppo carries is a couple of hundred quid.