. 6 digit display counters with electrical s without input voltage is Display LCD display Set: reset panel or terminal Signal input: or voltage Minimum counting signal: H7EC-6 (8)-50ms (10 times/sec) Power supply: internal power Count: 0 -999999 / 999999999 Ambient temperature: minus 10 degrees to 40 degrees C (but not freezing state) Operating humidity: 35-85% RH Size: 4.8cm(1.89in) × 4.5cm(1.77in) × 2.4cm(0. 94in) Features: Internal self-powered, no external 6 or 8 LCD displays, large and clear displayLeft side panel with lock to prevent misuseYou can input a signal or the number of signals is accurate and reliable Maximum counting rate 60 seconds/second, 200Times/sNo mechanical wear, long life alternative to electromagnetic counterNote: please allow 1-3cm error due to manual measurement. Make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package Included:1 x Electronic Counters