SINEDY Car LCD Tyre Tire Pressure Gauge Keychain Practical Useful Place the nozzle of the gauge over the tire valve. Press firmly to ensure good seal and prevent air escaping. Hold gauge on the valve until the reading on the LCD display locks. Remove the gauge quickly from the valve an read pressure. To retake the reading simply place the nozzle over the tire valve again and repeat. Increase fuel efficiency, environmental friendly & gas-saving.Keychain design, easy to carry.Reduce tire wear & extend tire life. A must have item for monthly-tire-check.Stop excessive tire wear with proper inflation.Improves vehicle handling and safety. With LCD screen display for easy reading.Perfectly fits the needs of travelers & drivers.Material: engineering plastic.Powered by: cell lithium battery (included). Range: 2.0-99.5 PSI, 0.15-7.00 BAR.