Dual head service gauge. Provides accurate, long life, and trouble free performance. 12-3/4 inches long. Precision seamless drawn, nickel-plated brass tube features a 4-sided nylon indicator bar that is hot stamped, not pad printed. 100\% calibrated across all 3 PSI (pounds per square inch) ranges before leaving the factory. Includes a hang-up loop for easystorage.