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Replace messy u-tubes (water Column Manometers) and expensive pressure gauges with digital Manometers. Features measure pressure of air and natural gas auto power off after 40 minutes applications adjusting appliance regulators setting delivery pressures leakage "shut-in" Test regulator adjustments for pressure and lock-up tests Test for leaks in low-pressure gas systems isolate difficult pressure problems on natural gas and propane systems Test pressure switch operation on a 2-Stage gas furnace in both positive and negative pressures static pressures in air ducts for air balancing check air filters by measuring pressure drop.