I would also ditch the humidity gauge that you have. I recently switched to this and I'm really happy with it. I tested the humidity with the below test kit, was spot on, didn't need any calibration. Temperature reading was also spot on.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
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