Of course laser levels are no more accurate than a level + long
straight edge since it all comes down to the bubble. Best long
distance level is a water tube. I made one from a old bit of hose
with some clear plastic tubes I had (eprom carriers to be precise).
You need a good seal and to make sure there is no air trapped as you
fill it (i.e. raise both ends so it is a smooth curve down and back
up. With that I can get say a 10m wall level +/- 1mm.
Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK
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