Traditionally with a wire and a spirit level, in fact the wire and
the spirit level are two very different measurements, they measure
different characteristics of a guide. Here the wire measurements are
absolute measurements where the spirit level measurements are
incremental. Additional we measure an angle with the spirit levels and
calculate the hight. So there can be large differences between spirit
level measurements and laser based or granite stone based measurements.
The advantage of our ProLine system is here that we measure both axis simultaneously and absolute!