Baseline Transparent Hires plastic goniometer permits observation of joints axis of motion, and its range of motion. The Hires design ads a white line behind measurement gradations to make the readings easy to see. The 180 degree/360 degree 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.