I am looking for a way to measure the relevant height of objects. If I am
building a house I want to make sure the roof is level. I know you can use a
laser level or string level but if you do not have line of sight or there are
obstruction in place how do you do it and be accurate to 1 mm. I thought go
may be able to measure the gravitational force at one spot and compare it to
another spot and therefore work out a difference in force which means thatthe
second spot is either higher or lower than the first.
I think your best bet may be a transparent hose full of water.