This is a nice unit to have for anyone doing any serious 4 wheeling on rocks, snow or sand. This has a built in valve core remover and gauge. Simply pull the valve core section away, screw onto your tires air valve and get a reading. Now push in the valve core remover to untwist the valve core from the stem. Your wheel will not deflate and you can stop it once you get to the desired pressure, twist the valve core back in and remove the tool. Come with a heavy duty pouch as well.