The plexiglas flowmeters a/m-2 and a/m-3 are measurers with more chamber of measure. They are suitable to control contemporarily 2 or 3 gases, they can be realized with independent input and output or inique output. Equipped with regulation valve in nickeled brass or AISI. Maximum working temperature: 55°C. They are particularly proper for the use in gasotherapy, control of cryogenic gas, chromatography and analysis.