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This electronic stop clock is state-of-the-art with a timing accuracy of ±.02% and a range of 0-99.9999 seconds.
It features a six digit LED and three timing modes; normal, memory, and period. The clock operates with one or two photogates.
The memory feature permits you to time two interruptions of a single gate and store the result (you’ll find this mode useful to measure conservation of momentum on an air track). The period timing mode makes an easy lesson on simple harmonic motion.
The accuracy of the normal mode is excellent for experiments in mechanics. The stop clock operates on 120V, AC and comes with one (68328-01) photogate.

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