Durability and Precision ESAB Ar-CO2 Flowmeters have a heavyduty design suited for industrial applications of MIG & TIIG welding with 60psig inlet pressure. Its back-pressure compensation mechanism ensures accurate readings at all times with Ar, CO2 as well as Ar-CO2 mixtures. ??? Heavy Duty Design with Brass body??? Unbreakable Polycarbonate tube??? Corrosion resistant SS316 float??? SS wire mesh Filter to arrest impurities??? Fine control with micro-metric spindle??? Operating range -40 to +60 0C