Arthrodial Protractor Made from transparent, heavy gauge plexiglass. Used to measure joint flexibility and range of motion. Ideal for difficult-to-measure cervical rotation, lateral flexion of the head and anterior-posterior cervical flexion. Bubble level ensures measurement on the horizontal plane. Includes two 180° opposing scales in 5° increments. Latex free. 12"H x 18"W (30 x 46cm). Opening of 8".