Why are Relative Humidity values from the PosiTector DPM sometimes different than those obtained from a Psychrometer?
A. When using a psychrometer, Relative Humidity must be calculated from the observed wet and dry bulb temperatures of a psychrometer and there are many opportunities for interpolation errors. Slight differences in these values as obtained from temperature scales and humidity look-up tables can cause considerably different results. Here is an example: Lets assume that thermometers read in 1 degree increments, but that you could interpolate to a degree.
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