wireless gas meter 1, double display; 2, Aluminum shell or steel shell. ... -in antenna;♦ Very easy operation.QUALIFICATION nominal flow rate: 1.6m3/h, 2.5m3/h, 4 m3/h max operating ... . The distance to fire source should beyond 1.5m; ♦ It must be test carefully when installation finished. It can be ... used if no air leak but no direct-fired test; ♦ Keep away from damp and mordant environment in order ...