Help with Hygrometer

[BillinIndiana]

The probe measures the outside temperature, inside the box there is a second temperature sensor (the inside temperature sensor) and the humidity sensor

The problem with the analogue hygrometers from petsmart isn't that they don't work out of the box, but that they quickly stop reading accurately.

Well so far the digital is up to 65% and the 1st time in the tank the Analog is up to 75-78% (hard to read)