Rugged precision made phosphor-bronze Bourdon tube movements assuring maximum accuracy To be used with air or water only Type - Pressure MIP - Lower Produced with the highest grade materials 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.Features. Rugged precision made phosphor-bronze Bourdon tube movements assuring maximum accuracy. To be used with air or water only. Type - Pressure. MIP - Lower