Properly inflated tyres save you money by reducing fuel consumption and maximising tyre life. This gauge is compact (72x40x22mm) with a big backlit LCD display, making it nice and easy to read. The gauge measures tyre pressures in either PSI, BAR, kPa or kg/cm2. The tread depth tool uses a metal slider that stores within the body of the unit and displays digitally in mm or inches. It also includes a small LED light to help out in low light conditions.