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Also be careful with gas station air pressure meters, those are typically abused quite a bit and can be way off. That is why I carry my own tire pressure meter so at least if there is error, it is constant, it did not cost much and is rather small digital unit, battery has lasted 10 years on it.
Of course, old mechanical pen type might be bit better as those might be more accurate than cheap chinese plastic things, but haven't seen those elsewhere than at my grandfather's garage when I was a kid.
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