The first Hygroset was in fact defective. I recieved a replacment unit and it calibrated very easily to 75% with the calibration kit. I did notice on the one that works, the calibration button has a much more positive clicking sensation. The defective one just turns without clicking. It is said that up to 1/3 of all new electronics on the shelves are defective.
I just wish I would stop getting the bad third.

Rich