The CROM 3 is the next generation of inclinometer based measurement instruments. Like the original CROM, it has a patented mainframe and rotation unit for range of motion measurements, but with the addition of three-inch ball inclinometers, it is easier to read and use. The ball technology reduces the inclinometer sensitivity to vertical positioning and the three-inch inclinometers read to one degree. The CROM 3 can be used for all cervical range of motion measurements. A specially adapted head forward unit for protrusion, retraction and dorsal glide can be purchased separately.