Digital Hygrometer Calibration

[choctlab]

Greeting All,

I am interested in obtaining a digital hygrometer.

The Credo digital's description indicates that its calibration can be manually adjusted. I cannot find the same description for the Western Caliber III. Is it the case that the WCIII cannot be manually calibrated; and perhaps that's one reason for the substantially lower price? Either way, is the Credo Digital of substantially better quality to warrant nearly double the cost?

Thank you in advance,
-= Mark =-