The new BeeSpi has two parallel detectors and a digital display to show the speed of any object passing through its 40 x 30 mm tunnel. This allows many items to be used, from ball bearings to model cars with and without loads. Speeds from 0 to 28 mps (0-99.9 kph) enables accurate and immediate readings to be taken, and with a second unit, velocity and acceleration on level, inclined and vertical planes can be shown. Additional settings measure lap time and cumulative lap time, so you can use BeeSpi to precisely measure the period of a pendulum.
Requires two AAA batteries (not included).
A Photogate holder, which can attach to a bosshead and then retort stand, is also avaiable.