Fine Adjustment (F A) Valve with or without Metal Body Jacketed Flowmeter is also used for oxygen therapy. It is made of brass BS 249 duly polished & bright chrom plated. The calibaration accuracy of the metal body jacket flowmeter is within ± 10% of the set reading. Flow indicating ball is made of Stainless Steel which spins steadily to ensure easy reading of flow. A humidifier is available for connection to jacketed flowmeter's bottom for administering moist oxygen to patient.