The Milton Industries MIS-531 Compact Digital Tire Inflator is a must-have for any mechanic or car enthusiast. This device has a pressure gauge that displays 255 PSI, a straight head air chuck, a 15" hose, and a 360 swivel. It is made in the USA and is industrial grade, meaning that it is built to last. The Milton Industries MIS-531 Compact Digital Tire Inflator is a must-have for any mechanic or car enthusiast. This device has a pressure gauge that displays 255 PSI, a straight head air chuck, a 15" hose, and a 360 swivel. It is made in the USA and is industrial grade, meaning that it is built to last.