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Hi, I understand that laser measurers work by sending a beam of laser light to the object and measuring the time it takes to get back. What I've wondered after using mine is how accurate they are on the red laser dot or is the red laser dot just a rough guide to aim at and not very accurate? Vijay

OK, I've had enough. How on earth does anyone aim their laser measure if the distance to be measured exceeds - say- two meters or so? I attach the measure to a diddy (a few centimeters) camera tripod, the measure has an in-built spirit level. The stated range is 70 feet, and I was trying to check something 13 feet away. The laser is about a strong as a candle on the top of Mount Everest: the cat had great fun chasing the spot. That was the only way I had an inkling where the spot pointed. Have I bought a Frolicat laser toy, not a measure? (Image url, permsion requested)

Background: 2 new extensions old bungalow with slab removed, dug down to 500mm, compacted hardcore down in most places New concrete slab to be laid with UFH (over 300mm insulation) - no screed layer. First door in which acts as my 'datum' Now that I have main door installed with low level threshold, I can proceed to determine my FFL throughout the house. I had previously determined levels with one of these self=leveling cubes: http://www.screwfix.com/p/stanley-cubix-self-levelling-laser-level/69712. To be sure the levels were correct I also bought one of these http://www.ebay.co.uk/itm/PENTAX-LASER-TILTING-LEVEL-TL-1-SURVEYING-/141961706661 (but from a local UK specialist, not ebay) which seemed like a decent bit of kit until i first tried it and it's clear it needs a service as it must have been used as a demo piece at best as the laser point does not zero in less than about 70mm from a distance of 5metres!! So i resorted back to the Stanely cube but now each time I carefully check my levels they end up being different. So have zero confidence in using that now. It's more to assist with shelving and tiling but as it's self levelling it did originally give me consistent floor levels....up to now. So prior to putting in my 300mm of insulation I need to go round the house again and re-check levels from my 'datum' (low threshold door). I've now got my eye on something like this: http://www.ebay.co.uk/itm/like/131976544466 Would that do the job? I could hire, but the whole flooring process will take me a while with many rooms to compact the hardcore (where it still need a bit of persuasion), lay down the EPS etc. So don't want to keep hiring lasers over a few weeks. I did contemplate getting out the old spirit level and going round like that, bit by bit...but can't see getting across 20m from one end of house to the other accurately!! TIA!!