♦Works on the multi-channel transit-time principle. The accuracy is 0.5%. ♦Wide bi-directional Flow range of 0.01 m/s to 12 m/s. Repeatability is less than 0.15%. ♦3.6V 76Ah battery power supply,with lifetime over 10 years (measuring cycle: 500ms). ♦Low starting flow, super wide turndown ratio Q3:Q1 as 400:1. ♦With storage function. Can storage both forward flow and back flow ♦Hot-tapped installation, no pipe line flow interrupted. ♦Standard output is RS485 modbus, Pulse, NB-IoT, 4G, GPRS, GSM can be optional. ♦Two channels and four channels can be optional.