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I am attempting to calculate wet bulb temperatures needed for agricultural curing processes. I am trying to do this by inferring the wet-bulb value from relative humidity and dry bulb temperature.

The problem is this: My measured relative humidity using a shtetl 30 sensor is about 45% when, according to the 4 degree difference between dry (28 deg) and wet bulb (24 deg) , it should be reading 75%.

What am I missing? Why is my relative humidity sensor getting it so wrong?

I tried another sensor brand (albeit with the same RH method of measurement) and likewise got humidity in the region of 45% when it should have read 75%.

Has anyone else experienced this issue? If so, how did you resolve it?

Many thanks in advance!

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