... stability;♦ Build-in antenna;♦ Very easy operation.QUALIFICATION nominal flow rate: 1.6m3/h, 2.5m3/h, 4 ... 104dBcommunication distance: distance between antenna and earth is 2 m, unobstructed communication distance is 1000 mBattery capacity and operating ... by the meter. Wireless meter system is made of basic meter, meter reading, wireless communication module, handy-meter and meter main station system ...