PSI stands for pounds per square inch, the unit of measurement for tire pressure. When you hear your mechanic say your right tire's at 30 PSI, it means that's how much air pressure it has.

It measures up to a maximum of 150 PSI and can also measure in BAR, KPA and Kg/cm2. It’s powered by a lithium coin battery and has a backlit LCD display to easily read your pressures.

2. Common Pressure Range: - For most passenger cars, the recommended tire pressure falls between 30 to 35 PSI. - This range is suitable for normal driving conditions.