Baseline 6-Piece clear plastic goniometer kit includes 1 each 12", 8" and 6" 360degree goniometers; 1 each pocket 180degree goniometer, 360degree rulongmeter and finger flexion/hyper-extension goniometer. Transparent plastic goniometer permits observation of joints axis of motion, and its range of motion. The head has three scales calibrated to be used with the ISOM (International Standards of Measurement, STFR) system. Arm has a linear scale in inches and centimeters and remains at measurement position until reset. Angle scale reads 1degree increments. 6-piece Set