... .Accuracy:1% 3.Repeatability:0.5% 4.Output Mode:RS232/485,4 ~ 20mA TDS-100W Ultrasonic Water Meter Item The Specification ... liquidsOperation MethodsMagnetic operating rod, the internal pairs of keysOutput ModeRS232/485, 4 ~ 20mA standard; M-BUS, GPRS, CDMA optionalWorking temperatureambient temperature ... %, significantly extended battery life TDS-100 ultrasonic prepaid water meter/pulse water meter