Dial indicating process pressure gauge. Stainless steel gauges are specifically designed for demanding applications in the chemical and petroleum processing industries. 4-1/2" Dial size bottom connected; single scale. +/-0.5 Percent full scale ASME grade 2A accuracy. Working pressure limitations: for dynamic pressure, the working pressure should be limited to 60 percent of the dial range. Static pressure: the working pressure, when no sharp fluctuations occur, should be limited to 90 percent of the dial range. -40 to 150 degree F Ambient temperature. -4 to 212 degree F Media temperature. Used is chemical petroleum and petrochemical refineries, utilities, food processing plants, paper mills, power generating stations, water treatment plants, wherever accuracy, safety, readability and reliability are crucial.