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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!!