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You can't rely on guesswork if you expect to accurately manage tire pressures. Knowing the tire tread temperature and the cold and hot pressures is really only half of the equation. The temperature inside the tire and the condition of the air inside also affect how much pressure gain a tire will see.
This lightweight digital meter displays the temperature (°F or °C) and relative humidity inside your tires. Just press the adapter onto the valve stem and let some of the air blow past the sensor.