195FM-9 flowmeter are designed for accurate regulation of gas flow. Body machined from class "A" brass. Polycarbonate flow tube and hood are impact resistant for maximum durability and service life. Calibrated for argon, CO2, and 75% argon.25% CO2 mixed gases at 50 PSI inlet pressure. Easy to "fine-tune" flow settings with adjustable brass knob. UL Listed.