1. Double-shield enclosure 2.Velocity ratio 200:1 3. Type: antimagnetic 4.Big Print Wheels Electrical pulse counter1. Digit wheel diameter: 23.6mm2. Digit size: 3.5 x 6.75 mm3. Working voltage range2.8V~7.5V4. Driving pulse width80ms5. Motor Resistance450Ω±30Ω Electronic Counter