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https://www.lansoinstruments.com/how-accurate-are-air-pressure-gauges.html

As a general rule a common plunge bourdon type gauge you would purchase will be accurate to + or – 3 psi when it is new. The accuracy of these different types of bourdon tube pressure gauges is also affected by temperature, humidity, and altitude. Note: Always check the tire pressure when the tires are cold, before traveling.

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