You are looking at a: Manifold Pressure Test Kit: Analog 0 to 35" of Water Column (Model: GM15) w/Case, Tubing & Brass Adapter Measure Natural gas (methane) or LP gas pressure across appliance manifolds, like gas stoves, furnaces, dryers and other gas appliances. Can also be used for other non-corrosive gases. This is a National Safety Product. More products and information available at https://viot.us/HVAC Features: Large 2.5 " sensitive diaphragm gauge is calibrated in inches of water column, also shows ounces per square inch Magnified lens for easier readingEasy to use, just attach the brash adapter to the appliance and hook the tubing to it and read the pressure. Specifications: Range:0 to 35 inches of water column (in. H2O) , 0 to 0 to 65 mm Hg (torr) Never need to mess up with water in glass tubing and guess if the column is plumb! Package Include/Supplied with: The Manometer gauge: 0 to 35 inch water column manometer; 3' of rubber/silicone tubing with a brass fitting(1/8" NPT) to the appliance manifold port; a hard plastic carry case for easy carrying for easy storage and carrying around More HVAC tools available at https://viot.us/HVAC Thank you for looking.