--SHOP-GRADE ACCURACY - mechanic recommended, performance tested, & certified accurate to professional ANSI 2A standards (\u00B10.50% FS), ensuring trusted readings w/ readout resolution to 0.10 PSI so you can quickly maintain your tires w/ superior precision.\n--RUGGED & RELIABLE - feels sturdy in the hand & built from 100% solid brass shielded by our rugged shock-resistant protective guard to protect accuracy from drops. Features rugged 2.25\"" brass stem with 360 swivel angled tire chuck w/ extended tip for an airtight seal to tire valve stem.\n--ADVANCED ENGINEERING - all readings lock-on to the display until the \""ON\"" button is pressed to zero reading. Features built-in rapid air bleeder valve to quickly air down overinflated tires.\n--HIGH RESOLUTION - LCD display screen features battery life indicator & bright LED backlight for perfect visibility anytime. Features smart battery saver that powers gauge off after 150s of inactivity to preserve battery (2x AAA bat!