Product review (1 stars): The remote display would repeatly jump from 45F to 158F while calibrating.  3F off when it did work.
While calibrating the unit, the remote display feature would jump from 45F to 158F.  Removing the batteries reset the display but the problem reoccurred.  When it was working the indicated temperature was 3 F lower than actual temperature measured by a calibrated and traceable thermometer.  The erroneous temperature reading alone was enough to reject the unit.  Never bothered trying to calibrate the humidity sensor.  Returning the unit to Amazon.