This is a brand new Harris pressure gauge with a face diameter of 1.5 inches (38.1 mm) and a maximum pressure of 30 psi (2.1 bar). It has a connection diameter of 1/8 inch and can be mounted on the side or bottom. This gauge is ideal for use in air pressure systems and is suitable for hydraulics, pneumatics, pumps, and plumbing applications. The unit quantity is 1 and it comes with the model number #9006044.