https://www.eso.co.th/product/195048-193313/fdm06-l-rx-airflow-eyctech
FDM06-L-RX Bi-directional Air Flow Transmitter
Range 0.1..30m/s ,Probe length 167mm, Output 4-20mA , Relay , RS485,Display, Remote type, EYC-TECH , Bi-directional Air Flow Transmitter
air flowrxbidirectionaltransmitter