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This high-quality timer, accurate to 1%, is essential for most CPO experiments including measuring velocity, frequency of sound, and free fall. It displays dual frequency and the difference between the two, as well as measurements up to 20 kHz. The stopwatch records from 0.01–199 minutes with 0.0001 resolution; the dual counters record from 0–19,999; and its memory features store up to six successive measurements. It runs on the included AC adapter or 9 V battery, available separately. It also comes with two photogates and a user’s guide packaged with the timer in a convenient case.
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