Velocimeter, Beespi.

Improved features! *3 Units of Measurement: km/h, m/s, cm/s *Improved Memory: last 5 measurement results are stored *2 Distinct Buttons: 1 Start, 1 Select *2 Measurement Modes: Speed and Cumulative Lap Time   Our compact, battery powered double photogate has built-in display, making it ideal for measuring small moving objects. Use it to measure free fall speeds, dynamics cart and projectile velocities. Two parallel photogates, 40 mm apart in a U-shaped housing detect, measure, and display objects passing through the photogates. Range: 0-99.99 km/h; 60 x 60 x 50 cm; weights 55 g. Needs two AAA batteries, not included. Includes clock to measure lap times of repeated events.