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A tire-pressure gauge is a pressure gauge used to measure the pressure of tires on a vehicle.
Environmental conditions can introduce a 13% to 15% variability in pressure due to temperature (0 °C to 40 °C), and additional changes can result due to altitude. Most car owner manuals do not state rated pressure as a function of temperature or altitude and leave it to the user to make appropriate measurements.
Since tires are rated for specific loads at certain pressure, it is important to keep the pressure of the tire at the optimal amount. Tires are rated for their optimal pressure when cold, meaning before the tire has been driven on for the day and allowed to heat up, which ultimately changes the internal pressure of the tire due to the expansion of gases. The accuracy of a typical mechanical gauge as shown is ±3 psi. Higher accuracy gauges with ±1 psi accuracy can also be obtained.
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