Measure Natural gas (methane) or LP gas pressure across appliance manifolds. Test gas stoves, furnaces, dryers and other gas appliances. Can also be used for other non-corrosive gases. Large 2 in. sensitive diaphragm gauge is calibrated in inches of water column, also shows ounces per square inch. Magnified lens. Easier to use than a manomete. Range: 0 to 15 inches of water column (in H2O). 0 to 9 ounces per square inch (oz/in2). Includes: 2 in. Sensitive Diaphragm Gauge. 3 ft. of rubber tubing. Brass fitting for quick connection to the appliance manifold 3/8 in. NPT. Rugged hard shell case padded.