The flowmeters type RM/145-2 and RM/185-2 are devices for the supply of medical gases with two meters suitable in respiratory therapy. The measurement tubes are integral within the body of the unit and the inlet connections are at the bottom of the units and arranged to be connected to the hospitals centralized gas plants or to gas cylinders completed with pressure regulators. For veterinary use, an anesthesia evaporator can be connected at the outlet of the dosage unit.