Has 3 functions of deflation, inflation, tire pressure check. Please note that inflation needs to be used with an air compressor. your tires as you need. This air gauge is a 'first aid kit' for you car.

Battery Saver HD Digital Display - The high-definition digital display has two modes, backlight on and off, so you can get a clear reading in any environment. Automatically turn off after 20 seconds of inactivity. Save battery power and extend usage times.

Measured in PSI, KPA, Bar and Kg/cm^2. Equipped with 1/4 inch NPT quick-connect fitting, this tire gauge is compatible with all Schrader valve stems (the automotive industry standard) and most air compressors. The NPT thread makes it easy to find adapters for other sizes of compressor outputs. Perfectly handle the pressure of Cars, Trucks, Motorcycles, SUVs, Offroad Vehicles, RVs, Trailers, etc.

Batteries are included (This tire pressure gauge uses AAA batteries).