Goniometer is an instrument that measures the available range of motion at a joint. The art and science of measuring the joint ranges in each plane of the joint are called goniometry.

To measure the range of motion physical therapists most commonly use a goniometer.

The advantages of goniometry are the simplicity in assessing ROM, the direct measurement of joint angles without any data reduction process and the low cost of the instrument.

The clear plastic from the Saehan Goniometers permits observation of joint’s axis of motion, and its range of motion.