Compact and easy to use BeeSpi V photogate by Narika Products. 
Use this handy photogate to measure free fall speeds, cars and projectile velocities. Two parallel photogates detect, measure and display speeds of any objects that pass through its 40 x 30mm tunnel, from zero to 99.99 km/h. Also measures in m/s. This unit can measure Lap time 0 to 99.99sec and Accumulated Lap Time 0 to 99.99sec.
The BeeSpi’s memory function can save up to the 5 latest measured data.
Dimensions: 60 x 60 x 50mm (overall). 40 x 30mm (inner) - 55g (without batteries).
Requires 2 x AAA batteries (not included).
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Prices (each):
$96.00 (1 - 4 units);
$91.00 (5+)