I recently bot a proper tire gauge and what I discovered was a bit surprising. I just bot a Michelin Digital Tire gauge and it exposed to me the amount of error in my regular analog version. These tests are unscientific, but it's what I have experienced:
Marin of error in PSI +/-:
Michelin Digital Tire Gauge: 0.1 -0.3
Slime Brass Tire Gauge with Bleeder Valve: 0.5 - 1.0
Cheapo Pen Version: 1.0-2.0
Moral of the Story: Considering how import tire pressure is in a car, it's worth spending $20 on a good one. (Especially for guys who are as neuotic as me
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