Please use tire gauge to test the wheel pressure every week regularly when the tire is cold especially before long distance travel. Hyper Tough High Pressure Tire Gauge (Model ST111702S) is designed for daily use required at the service level. It is equipped with two zinc alloy head push-pull chucks 30 degree forward head is specially designed for inner/single wheels or hard-to-touch valves and 30 degree reverse chuck for outer wheels. 6 long stainless steel stem allow you to reach the inner wheels without dirty your hands.4 sides white ABS scale plate with black clear marks scale 20-120PSI perfect for truck bus car SUV RV ATV bike (with Schrader valve) or motorcycle. Pocket-size pencil style and pocket clip are designed for easy storage. There are also 4 free plastic valve stem caps for replacement. Twist off the valve cap press the mechanical tire gage chuck to the valve then the scale plate will slip out and you can read the tire pressure from the scale plate. After using please twist on the valve cap and push the scale plate back. No battery needed. For sedan 28-35PSI is perfect.