I ordered one of these after your first post and after it arrived I tested it on a completely deflated car tire. I set the pump for 40 psi, attached it to valve on the tire, turned it on and watched it work. It inflated the tire in a few minutes then shut off. I checked the tire pressure with a digital gauge I normally use and the pressure was within one pound. For $40.00 I think it is a great bargain. I am leaving my 12 volt pump at home when I leave for Colorado. Thanks Chris for the heads up.
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