meter counter: 1,ratio: 100:1,200:1,400:1 2,Number:5+1 or 6+1 3,Voltage:3 ... .5v to 6.5v ISO9001: 2008 meter ... : 1 20: 1 40: 1 80: 1 100: 1 200: 1 400: 1 800: 11000: 12. Start-up work ... voltage no greater than: 2.8v3,Normal working voltage: 3.5v to 6.5v4,Pulse ... GB/T17215Note: technical indexes for JDC3 double rate meter are identical.