Specification: Measurement Ranges: 10-150PSI Ideal for trucks, SUV's, and RV's Designed for heavy duty use required at the service level This dual head straight foot service gauge is specifically designed for easily reaching inner dual Instructions for use: 1. The vehicle needs to be parked on the ground, so be sure to measure the tire pressure when it is cold 2. Check if the reading of the tire pressure gauge is at the position of "0", and press the button on the side of the tire pressure gauge to clear it 3. Remove the valve cover of the tire and press the pressure gauge of the tire pressure gauge perpendicularly to the valve on the tire The speed of press-in needs to be fast so as not to cause air leakage inside the tire 4, quickly dial out the tire pressure gauge after the pointer is stable, then reading 5. If the tire pressure is too high, the tire pressure gauge can be used for deflation if the tire pressure is too low, the air pressure should be immediately applied to the safety tire pressure, and the accurate tire pressure should be re-measured 6, the tire tire pressure gauge is cleared, the valve cap is returned Precautions: Check the air pressure of the tire at least once a month. You can measure several times to determine the correct reading before you are not familiar with the tire pressure measurement Package Includes: 1 x Air Tool Service Gauge