Two Crystal-controlled, Calibrated Frequencies: (10 Hz and 50 Hz), accurate to 0.1%. The 50-Hz frequency is ideal for free fall experiments. The slower 10-Hz frequency is best for most dynamics track experiments. Includes an Internal 9-V Battery, or Use an Optional External 9-V AC Adapter/ Power Supply. Carbon Paper Discs: Used for printing. The adjustable disc holder allows the printing point to be adjusted, giving a long life to the discs.
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