This Test Kit is designed for rugged, heavy duty field use. It can measure natural gas (methane) or LP Gas pressure across appliance manifolds. You can test gas stoves, furnaces, dryers, and other gas appliances. This kit can also be used for other non-corrosive gases. The large 2in. sensitive diaphragm gauge is calibrated in inches of water columns and it also shows ounces per square inch. It is easier to read than a manometer and has magnified lens. The range is 0 to 35 inches of water column (in H20) 0 to 20 ounces per square inch (oz. /in). The kit includes 2in. sensitive diaphragm gauge, 3’ of rubber tubing and a brass fitting for quick connection to the appliance manifold 3/8in. NPT in a molded hard case.