Analog Manometer Pressure Range -50 to 50 in wc For Tubing Diameter 0.187 in Maximum Operating Pressure 50 psi Maximum Pressure 50 in wc Minimum Pressure -50 in wc Scale Units in wc Series 1211 Manometer Type Flexible U-Tube Housing Material Vinyl-Plastic Includes Gas Pressure Kit No Fluid Color Green Includes (1) Bottle of Fluorescein Green Color Concentrate with Wetting Agent (2) Nylon Rubber Tubing Connectors Magnetic Mounting Clips Plastic Case Lens Material Nylon Plastic