Got it for review but will end up giving it away. I've had one for a number of years that appears to be identical, albeit under a different name. Going back to the inflators, which were solid but popped out to show approximate pressure on an engraved brass scale. It's probably a collector's item. Here you can simply increase the pressure with the trigger or decrease it with the reset button to get exactly what you want, even with low volume tires like those found on bicycles and lawnmowers. double on my camper. Now I can make the insides just as easy as the outsides without the extensions that always tend to leak. When I think about how much time and frustration this item has saved me, I would say this is one of my best purchases.