Pocket Smart Timer
Gelsonlab HSPM-050 Educational Pocket Smart Timer with built in photo gate and battery
Pocket smart timer with built-in photo gate can measure time, speed and acceleration . Microprocessor control offered 0.01% accuracy. 2 AA battery for 2 hours continuously working . Large internal Memo up to 20 data points can be recorded Direct reading acceleration result down an incline plane (need a 25mm ball which not included) more than just one timer. Link two timer with a special cable supplied to build up a 4 photo gates system in one second .