The Mechanical Tire Gauge is a high quality tire gauge. It will gauge from 0-100 PSI. It has a durable rubber guard to protect it and has a rotating head to get to hard to reach valve stems. It is small enough to fit in the glove compartment for easy storage. It has the ability to decrease tire pressure in the event you put too much air in. By keeping your tires at the right pressure, you can improve your fuel economy. It has accurate readings. I tested it against another gauge that I own and the readings were spot on. Order one here.