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Parameters: Power supply: 1.5V(AA battery) Counting range: 0-99999 Highest counting frequency: 20HZ Minimum counting pulse width: 10ms Highest counting speed: 20/s Reset: panel/external Minimum reset pulse width: 0.1s Working temperature: -5 ~ 40℃ Dimensions: 64 x 38 x 38mm; Hole Size: 61 x 36mm Maximum resistance when connect point on: ≤ 10KΩ Minimum resistance when connect point off: ≥ 500KΩ Weight: about 0.05kg Note: The package does not include the 1.5V AA battery, please prepare it yourself! Package includes: 1x Digital counter 1xMagnetic Induction Switch