Re: Tire Pressure Guages/Consumer Reports
With only two gages, you'll never know; unless one of them was recently certified. The 4020 is probably more correct.
Try them at 50 psi too...
IMHO 1lb is essentially equal. (A difference of 5 psi is significant).
I work a lot in the field of environmental "testing" and have developed a real appreciation for accuracy and precision.
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