I am going to give you advice for the most accurate temperature and humidity monitoring devices that took me months of research and testing to find.
http://www.amazon.com/dp/B004167QI8/...keywords=xikar
Xikar temperature/humidity gauge. It is accurate to 1% humidty/temperature. Buy 3 of these and place them in the tank with double sided tape. 1 in the basking hot spot, 1 in the middle of the tank, and 1 in the cool side. These are used by cigar hobbyists for their cigars, but they just so happen to be amazing for snake enclosures.
To calibrate it, buy a Boveda humidty pack. You place the Xikar inside this pack and leave it for 4 days. You will get an exact reading of 74 to 75% humidty.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
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