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I was refering more to humidity and pressure being different. Humidity more than pressure.

I use it mostly for the Jr as Hum can have a great impact on fast it will run.

I guess the main thing in what ever weather staion you use is use it consistantly.

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Yeah I understand what your saying and maybe Iam not explaining it well. The Temp at the line is always higher because of the cars and people and burnouts.The temp at your trailer is the actual temp - down track. Leave it at the trailer.I watch people at the track putting the hand helds on the roof of cars in the sun and they dont read correct.Soon as you leave the line the temp changes.Sorry if this is to long.