The OS-8535 Linear Translator is used with PASCO Rotary Motion Sensors (ScienceWorkshop's CI-6538 and PASPORT's PS-2120). Moving the Rotary Motion Sensor along the toothed rack provides position data (20 cm with resolution up to 0.055 mm) to the computer. The Linear Translator mounts either directly to the PASCO Basic Optics Bench or to a 12.5 mm rod