Welcome to the site!
What you need is a good probed thermometer/hygrometer (hydrometers measure specific gravity, not humidity a hygrometer measures relative humidity)
This one from Walmart is affordable and accurate enough for a snake cage:
These cost $12 and measure 2 temperatures as well as humidity. You place the probe on the hot side of the cage, and the unit itself on the cool side of the cage.
You want to hot side of the cage to be between 88-92 F
You want the cool side of the cage to be between 78-82F
You want the humidity to be between 40% and 60% normally, and between 60% and 80% during shed.
Here is some more info you should read to make sure you have everything right:
Basic care requirements: http://ball-pythons.net/forums/showt...ius)-Caresheet
Cage Heating/Temperature Measurement: http://ball-pythons.net/forums/showt...t-Thermometers
A How To guide on Setting up glass tanks for BP's: http://ball-pythons.net/forums/showt...With-Pictures!
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