Patent ID: 8884770

Claim:
A compact sized manometer assembly for measuring air pressure, comprising: a housing assembly including a main body molded of plastic having two reservoirs, a panel molded of clear plastic having a sight tube, wherein said panel is sonic welded to the main body forming a permanent seal between reservoirs and sight tube, said panel forming a pressure tight enclosed chamber, and said panel having formed integrally thereon a chamber located in main reservoir for at least one of a zero adjust bladder or plunger; and a pressure measuring assembly including a storage reservoir for containing measuring fluid prior to a first use, a valve assembly threaded through the main body to allow fluid to selectively pass into the main reservoir, and said storage reservoir incorporates a vented cap plug used to contain fluid in the storage reservoir after filling, wherein said cap plug provides a means for pressure calibration by releasing precise amounts of pressure to the ambient thus lowering the pressure reading.