Protractor Goniometer: two opposing 180 degree scales and one 360 degree scale, all marked in 1 degree increments. Tension between arms controlled by a thumb knob. 14" long.
Robinson Pocket Goniometer: 6" long with 180 degree scale in 5 degree increments. Fixed leg has 5" linear scale calibrated in inches and centimeters.
8" Goniometer: two opposing 180 degree scales marked in 1 degree increments. Tension between arms controlled by a thumb knob.
14" Goniometer (Conzett): two opposing 180 degree scales marked in 1 degree increments. Extra long arms for measuring all joints.