The Dill Air Controls Black Service Gauge, No. SG-3, offers measurements in 2 psi increments, covering a range from 10-150 psi. This service gauge offers a black powdercoat gauge body, which provides a textured grip and more protection in the shop environment, according to the company. A set screw embedded in the end of the indicator bar provides the user with a simple method of re-calibrating the gauge when measured against a Certified Gauge Check Station during regular accuracy checks.