I use this digital one by Acurite:
https://smile.amazon.com/AcuRite-The...ite+hygrometer
You can find fancier, but this does the trick and so far has been very accurate. Use a temp gun to verify all temperature readings. Your setup sounds great but I didn't see you mention thermostats. ALL heating elements must be plugged into a thermostat - UTH and CHE both. If your heating is not regulated by a thermostat, unplug it now as they can easily spike too high and permanently damage your snake.
I started out using Jumpstarts while I saved for, and recently upgraded to, the Herpstat2.
https://smile.amazon.com/MTPRTC-Cont...mostat+reptile
P.S. Sorry for the AmazonSmile links...I support my local bat rescue
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