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Yes William i know very well they are very good, as they are used all the time in the building industry but i already have an excelent water level and although it is only accurate to about half a centimetre or better still i can only read it to half a centimetre, it works for me and i already have it.This method of determining the relative height of various points has been in use for centuries in the ship builkding industry and in fact i have heard they aligned the pyramids with a similar method.But of course tried and true is all well and good but we should move with the times as well.Rgds Ian
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