General Tools GPK005 Analog Gas Pressure Kit The General Tools GPK005 allows you to get accurate pressure readings when checking manifold pressure of furnaces and appliances that use natural gas Test gas stoves, furnaces, dryers and other gas appliances; measure natural gas (methane) or LP gas pressure across appliance manifolds Tool can also be used for other corrosive gases; the magnified lens makes it easier to use than a manometer GPK005 is calibrated in PSI and meets requirements of Section 406.4 of the New York City Fuel Gas Code (2008) This industrial tool has a 2.5 inch diameter diaphragm gauge and 39 inches of tubing; comes with a hose clamp and a molded hard case for safe storage