The Motion Detector uses ultrasound to measure the position of carts, balls, people, and other objects. Measure objects as close as 15 cm and as far away as 6 m. Sensitivity switch reduces noise and produces higher quality data for studying dynamics carts on tracks. Attaches easily to the Vernier Dynamics System. Pivoting head allows for flexibility in the experiment setup. Included are: Vernier Motion Detector Digital Sensor Cable Instruction Manual **This item requires the use of a LabQuest computer interface which is also available for checkout. Click the checkout tab to check this item out.