The device works. It swells well vehicle tires fairly quickly elsewhere, BUT, because there is a but, the gauge does not take off the zero! So if you want to know what is in your tire pressure ... better be near another gauge that will indicate the pressure. If a handyman has a trick to put this pressure gauge installed on the device function, I'm interested. Because this tool back to the seller, cost me more in time and money that I do not wish it.