The Milton S-976 Dual Head Chuck Service Gauge makes tire valves more accessible for faster and easier inflation. The Milton S-976 is a precision-engineered service gauge that provides performance with accuracy, longevity, and no hassle. Features of the service gauge include a plated brass tube and a 4-sided nylon indicator bar. With Miltons attention to quality, this service gauge is calibrated across all three PSI ranges with 100% accuracy before leaving the factory.