You will receive 1 garden hose valve pressure gauge simply screw onto your bib or on the end of your standard garden hose . This pressure gauge is a must have for anyone wanting to know the exact psi available for a new irrigation system or if you are experiencing PSI drops. I like the 160lb max gauges they give you a more accurate easier to read reading and the possibility of having 300lbs on a hose bib are extremely unlikely.