· Advanced accuracy: Professionally calibrated tire pressure gauges for cars. Accurately measures from 0-100 PSI with a resolution of +/-1 PSI.· 3-IN-1 Multifunction: Our air pressure gauge has 3 functions of deflation, inflation, tire pressure check. Press trigger to inflate tire, press reset button to deflate tire.· Universal compatibility: Our portable tire inflator for anything else that utilizes a schrader valve; also compatible with all quick connect 1/4" NPT air compressors and ¼" NPT Quick- Connect Fitting.· Superior construction: AstroAI car tire inflator with pressure gauge is built of high quality, heavy duty stainless steel and brass components that provide lasting performance.· Increased safety: Properly inflated tires provide better performance in all weather conditions, decreasing the likelihood of flats, explosions, and crashes.