Performance tested and calibrated to ANSI B40.1 accuracy standards (2%), ensuring quick and precise tire pressure readings up to 100 PSI without dealing with batteries or digital components. Rugged & unique 'Dual-Layer Protective Guard' shields the solid steel body from accidental drops and toolbox storage, so you can rest assured your new tire gauge will stay reliable for many years. Robust design comes equipped with a '360-Degree Swivel Chuck' for easy valve access, pressure reset button to reset readings, and built-in air bleeder valve to reduce pressure in overinflated tires. Compact size features an easy-to-read 1.5" dial (psi) and stores nicely in the glove box, center console, or tool kit; suitable for most cars, trucks, SUVs, motorcycles, bikes, spare tires, or RVs. High-accuracy Tyre Gauge,Dimensionlength 11.5cm, width 5.5cm. Measure Tyre Pressure : 1. Use the pressure recommended by your vehicle's manufacturer, This information is usually located in the driver's-side door jamb, glove compartment or owner's manual. 2. Check pressure when tires are cold and have sat for at least three hours. 3. Removing cap from inflation valve, Keep caps safe as they protect the valves. 4. Place the tire pressure gauge chuck firmly onto tire valve stem and press down evenly. 5. Remove gauge from valve stem to read tire pressure. 6. If the pressure is too high or too low, pls release or inflate to suitable pressure.