A simple gauge that measures the amount of air pressure in your tires. Read the tire to find out the ideal pressure range.

To operate, push the sliding measure into the tool, then remove the dust cap from your tire valve and press the mouth of the tool onto the valve. The measuring bar will extend. When it stops moving, remove the tool and replace the dust cap. The number at the lowest point on the tool is the amount of pressure your tire has, in PSI (pounds per square inch).

Press momentarily on the air valve to see current pressure.

The most visible section at the bottom of the bar is 35. This tire is inflated to 35psi.