... strong anti-disturbance capability, pretty appearance, etc.JM series electronic meter counter can be used in the ... data/not keeping data when power cut,counting frequency,step,range,etc are selectable12VDC/30mA12VDC/20mA72× 72 ... Contact signal:For relay,distance switch,microswitch,the frequency should be selected low speed(30times/s) ... 0-50°c, relative humidity≤85% JM Series Electronic Meter Counter