Free Fall Apparatus Economy, for determination of the gravitational constant ft gft, This kit has a wooden base, 1.1m rod and a movable electro magnet, can be moved anywhere on the rod, when the ball is released the timer is triggered and stopped one the ball his landed on the base
VWR* Visual Scientifics Photogate Sensor, Four Modes: Gate, Pulse, Pendulum, Frequency, also Works with VISUAL SCIENTIFICS and numerous physical science systems, This kit contains: 2 Photogates, 2Connecting wires, Main photogate hub and control, Wall charger