Feature:OOTDTY1. 5 digits large LCD display screen, large and clear2. Use ordinary AA battery, no external power and easy battery3. Press the pause button to pause/count, press the pause button again, and resume counting4. The input adopts ordinary signal, simple and convenient to select the sensor, accurate and reliable counting5. Highest counting speed: 20 times/second, 1200 times/minute6. Clean: Panel/outdoor useTechnical parameters:Power supply: 1.5V-AA battery (for safe, not included)Counting range: 0 - 99999Highest frequency counting: 20HZCommium pulse width counting: 10mSMaximum contact resistance: le; 10KOmega; Minimum contact disconnect resistance: ge; 500KOmega; Clear Method: Panel/ExternalClear Minimum Pulse Width: 0.1 SecondsAmbient Temperature: -5-40°c Dimensions: 64*38*38mm Hole Size: 61*36mm Usage:Start Counting: Counting the input terminal input signal, the counter starts counting. Pause counting: press the pause button to pause counting; Press the pause button again to resume counting. Clean panel: press RESET directly. External clear: clean the external pin of the terminal and clean it directly. Package Included:1 * Electronic Meter (Batteries Not Included for Safe )