Measure speed, lap time, and cumulative lap time with a single timer. Study the harmonic motion of a pendulum or the speed of a cart down an air track using 1 BeeSpi. Study free-fall acceleration or acceleration down an inclined plane using 2 BeeSpis. Measures speeds from 0.00 to 99.99 km/hr, 0.00 to 99.99 m/s, and 0.00 to 999.9 cm/s and lap time from 0.00 to 99.99 sec. Stores up to 5 measurements.