It is attached to the medical oxygen socket connected to the central gas system and is used to deliver oxygen to the patient by passing it through the humidifier through the nasal cannula and mask. The scale indicator and humidification jar are made of break-resistant polycarbonate material and can be sterilized at 134 ˚C. Flowmeters are manufactured in accordance with DIN (German), BS (British), NF (French) standards. Flowmeters are manufactured in accordance with EN ISO 7396-1: 2007, EN ISO 9170-1: 2008, EN ISO 15002: 2008 standards.