pressure question

By: cartester, 10:05 PM GMT on February 07, 2014

Hi - For my job (which is testing the performance of cars) we record pressure information (in Hg) at the time of the test using portable instruments. However, we're noticing that Wunderground's and NOAA's pressures are significantly higher than what we're seeing from their nearby station locations at the same time of day - often by over 1 in Hg. Another car-testing entity that uses different pressure-measuring equipment has noticed the same thing. Any ideas as to wh...

pressure accuracy

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