This gauge was to compliment my pocket pump. It's accurate, I also have the MotoPressor digital tyre gauge (also accurate), but the design of the inline tyre gauge with the valve at the supply end means you can use this as a simply tyre pressure gauge too. Handy for off roading if you want to drop your pressures. Click it on, press the bleed button drop your pressure and later on connect it to the pocket pump and get it back up again.