Milton Industries has been in the pneumatic fitting and tool game since 1943. This S921 model is a solid little 0-50PSI air gauge that’s proven to provide fast, accurate performance for the long haul. It’s brass plated with a four-sided Nylon indicator bar. The AutoZone Chinese made model is probably $4.95. This one’s only a couple bucks more and worth every penny. We include it in every Union Garage Tool Roll and now sell it a la carte—not because we’re getting rich selling them but more as a service. You’ve only got two wheels on the road; they’re both pretty damn important to keep properly inflated. We did the research so you don’t have to.