Product review (2 stars): Sensors are not calibrated
For $100 I would expect this to come out of the box calibrated.  To check, I put all 3 sensors right next to each other.  One registered 69, another 73, and another 81.  Seriously?  Either 2 or more of the sensors were defective or they were not calibrated properly.  The buyer should not have to calibrated the sensors right out of the box for them to work correctly.  I returned these and will search for a better option to wirelessly monitor temps and humidity.