SIMPLY BETTER AIR. Exclusive Quick Click 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 0 It takes 2-clicks of the calibration tool to revert the gauge back to 0 Specifications: Extended-reach Dual Head Chuck 2-side aluminum indicator bar, psi- Calibrated in 3-ranges before leaving the factory- Pressure Range: 10 psi to 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.