The 52mm Oxygen Pressure Gauge White, is a SPG that has been O2 cleaned, and is suitable for cylinders with up till 100% Oxygen filled.   It is Oxygen cleaned for use with pure Oxygen, or high Oxygen mixed gases.   - Larger diameter 52 mm gauge for easier reading. - Heavy duty nickel plated brass gauge with mineral glass face and polished finish. - Easy to read 0 - 300 bar scale, suitable for cylinders up to 232 bar.