This paper presents a new calibration method for industrial robots. The cal
ibration method is based on a combination of inclinometer and LVDT measurem
ents and is very simple to use. The inclinometers measure the deviation fro
m the gravity direction of a measurement rod and the LVDT sensor measures t
he length of the rod. The inclinometers can be used without any pre-calibra
tion and the whole equipment is inexpensive, portable and robust.