These gauges are suitable for Air, Oil, Gases and Liquids that are not corrosive to copper, oil and steel and for general Industrial Applications such as Boilers, Pumps, Compressors, machinery, Process & Chemical Plants. Case and Bezel is drawn steel, black finish and available in Bottom, Back Connection, Direct Mounting, Surface Mounting and Flush Panel Mounting; available in all standard process connections NPT, BSP etc. ; Accuracy ± 2% ; Dial Size 40, 50, 63, 80, 100, 150 and 250mm.