The flowmeters type EASYMED® are top-quality instant flow measurement devices with calibrated orifices for regulating the dosage of medical gases, particularly oxygen in oxygen therapy. They are manufactured with an integrated pressure reducer for the supplied pressure stabilization and with the outlet fitting with thread adapted to the various required applications. The body is made of impact-resistant polymer with brass plated fittings, while a large ergonomic control knob allows an operator smooth drive for the selection of an oxygen supply value between the 10 possible options. The calibration of the oxygen flow is ensured by orifices got on a metal support with the laser technology. The small size structure and the particular technical configuration allow the EASYMED® “dial” flowmeters to be able to supply flows of medical gas with extreme accuracy, oxygen in this case, even in the most difficult conditions, such as in emergency mobile units. They do not need, compared to conventional variable area flowmeters having vertical indicator, to be always and only used in the upright position.