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Tire Gauge
It is kinda like purchasing a bathroom scale at Bed Bath & Beyond. You put three-four scales on the floor, check the weight, and then pick one that you like that is consistent with another one.
Not saying to go out and purchase or try out 3-4 gauges in the parking lot but if you are like most gearheads, you might have 3-4 of them laying around in glove boxes, center consoles, with your pens/pencils, tool boxes....
Even those digital gauge can be off.
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