Pro TDS-100H-M1 (DN50-700MM) Ultrasonic Flow Meter Flowmeter Clamp On Sensor is
Communication Interface: RS-232 interface. 1 x Pair of M1 sensor(DN50-700mm). 1 x Pair of Clamp Fixture. 1 x Power Adaptor. Because it is like crystal liquid. You must use silica gel to replace.