How to operate the digital tire gauge:1. Press switch and select PSI or BAR setting with LCD back light for easy use at night.2. Place the nozzle of the gauge over the tire valve. Press firmly to ensure good seal and prevent air escaping.3. Hold gauge on the valve until the LCD display locks.4. Remove the gauge quickly from the valve and read pressure.5. Gauge will automatically shut off 30 seconds after use.6. Gauge can be manually turned off by holding the switch down for more than 3 seconds.
Specifications:Four Measurement Ranges: PSI: 0-150, Bar,KPA,Kgf/cm2Minimum Increment: 0.5 PSIPower Source: one CR2032 3V Lithium Coin Cell & three LR44 1.5V Button Cells (All Included)