SIMPLY BETTER AIR | Exclusive Quick ClickTM System Milton's field re-calibratable service gauge is designed for precise measurement and durability. We combined high quality componentry and dial-in accuracy for a long life and trouble-free Performance. Features a corrosion-resistant chrome-plated brass tubular body and a premium black anodized aluminum indicator bar. An extended-reach chuck and off-set head make it easier to measure tire pressure at almost any angle. A simple hook allows for convenient wall storage. Quick Click Mechanism With a quick click you can easily calibrate your gauge to the desired point just by “feel”. Simply attach calibration tool to gauge and rotate the stick to adjust – each precise click of the tool equals 0. 25 PSI Calibration Calibrate back to zero (0) It takes 2 clicks of the calibration tool to revert the gauge back to zero (0) Specifications: - Extended-reach Dual head chuck- 2-side aluminum indicator bar, PSI- Calibrated in three ranges before leaving the factory- Pressure Range: 10-160 PSI, 2 PSI Increments Drive Safely: Maintaining proper tire pressures improves vehicle handling, reduces risk of tire failure, improves fuel economy, and increases the life of your tires.