This psychrometer was very inaccurate right out of the box. The thermometer never read correctly, so the relative humidity reading is useless. Compare the constant readings from my Cooper pocket thermometer to the DSP1000 readings in my photo. The DSP1000 is off 15 degrees, and my pocket thermometer was tested to +/- 0.1 degrees Fahrenheit at 32 degrees Fahrenheit just a few days ago in an ice bath. Your product is junk. As a refrigeration mechanic, I would not recommend the DSP1000 to any other professional.
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