I followed the instruction steps on the box and it worked as it should. I pumped up 4 car tires from 28 to 32 pounds up to 40 each tire very quickly. After screwing air hose to the valve stem I let the air pressure on the gauge settle on a number for a bit, then I turned it on and a little after reaching the desired air pressure the pump automatically stops. If this keeps working like this I will have no complaints. So far so good.
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