µLevel is exactly a spirit leveler (inclinometer),its gravity keeps reference with all spirit levels. It is a superb aid for the measurement for machine level and straightness in vertical plane.At the same time,two µlevels can be used,it is a stand-alone instrument.The combination with a software,which guides us through the steps and documents results.In this,it serves as a continuous reference and also stores the measurements in the units and connect it to the software afterwards.These instruments measures in µm/meters.In sound silly,the applications deals with length of 10-20 meters.The curvature of the earth must then be taken into account when using systems with a gravitational reference.