The car was in for a changeover to summer tires. In this case, the car was not in "drive away" condition. On my way home, I noticed a distinct wobble in the steering wheel, which seemed strange since there was no indication of an alignment problem when I brought it in. At home, I checked tire pressures, and found one front tire at 17 pounds and the other at 29. I came back to your pump and topped up all four tires, and fortunately, this eliminated the problem.