Analog gauges are notorious for giving inaccurate readings. I would return that one and get a digital one.
I have found the dual dial by Zoomed is actually pretty good just in case you want analog.
http://www.amazon.com/Zoo-Med-Econom...ter+hygrometer
You need a tstat before using that uth. You also can not put the uth inside of a wood enclosure. They are designed to go on the outside of a glass or pvc cage. If you are planning on using it inside a wood enclosure without placing another floor between it and the snake you may need to rethink your plans.
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