... and long life small flow gas flow meter (min flow for gas is 15L/hr ) We are QUANZHOU RIXIN FLOW ... 4,No movable part, safe and reliable.5,Wide measure range, bigger than 1:30.6,Good repeatability, generally 0 ... hang weight method to test the flow meter.9,Measurement range can be changed by replacing target according to need. ... 1.5% ,liquid ±0.2% ±0.5 % ±1.5%Measuring range: gas 1:100,1:50,1:30,1:10 steam ...