Features Rugged precision made phosphor-bronze Bourdon tube movements assuring maximum accuracy (+/- 3-2-3%) under adverse field conditions. To be used with air or water only Type - Pressure MIP - Lower Dial Size - 2 in. Size - 0.25 in.POLYPROPYLENE CASE Bourdon tube movement is totally enclosed in corrosion resistant polypropylene housing acrylic lens. Resists rust electrolytic action and chemical solvents. Brass sockets standard.STEEL CASE Deep drawn one piece steel housing encases a quality movement. Genuine mar-resistant glass lens and brass socket connections are standard. - SKU: BSPS688