Dive shop air systems usually contain a number of pressure gauges. GMC stocks a selection of instruments with different pressure ranges, dial sizes, and mounting styles. Most of these gauges have an accuracy of 1-2% of full scale. CAUTION: THESE GAUGES ARE NOT INTENDED FOR USE WITH PURE O2 / NITROX WITHOUT FURTHER MODIFICATION AND ARE NOT SUITABLE FOR GAS MIXING PROCEDURES. SPECIAL TYPES ARE OFFERED FOR THAT PURPOSE (page 54).