Digital ZooMed For Tub???

So I recently decided to go with a tub for my ball pythons.
First, here is an image so I can get opinions on whether or not there's anything wrong with it.

http://imagizer.imageshack.us/v2/640...921/YiAoSj.jpg
The tub is a 21 qt. under bed sterilite.
I switched from bedding to paper towels for the obvious reasons and to bring down the constant 80-90% humidity in the tub.
Before, Sebastion was in something larger and he's been fine, so I personally believe the size is not an issue.
I have a UTH on one side, and was wondering with the digital thermometer I have, is it accurate? How should I set it up?
Currently I have the digital reading on the outside, with the wire and the (reader)? on the inside above where the UTH would be, and underneath the paper towels. But if its literally above where the UTH is, how is it accurately reading the entire environment instead of just the UTH it's on top of? So is it just the spot it's on being read? or the whole environment?

From what ppl told me, Digital Thermometer with 10-foot Temperature Sensor Probe and Humidity is the most accurate

I have a few of those zoo med thermometers, they are in a drawer. I have found they can be anywhere from 5-15 degrees off. Like above said the acurite 00891 is very accurate, it shows the same temp readings as my Herpstat and VE thermostats. Plus you can put probe on hot side and place the unit on cool side and then you will be able to read your hot temp, cool temp, and humidity from 1 unit. BTW I own 11 of the acurite.

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For me it really comes into the thing that I am measuring. If I want to know the temperature of a surface I use an infrared temperature gun.
If I want to know the ambient air temperature of an area I use the zoo med probes you have. They also work great for taking temps under water or buried underneath sand or other substrates. I use them for my red eared slider tank to measure water and in every tortoise enclosure I have to measure basking temps and ambient temps. They all work well within one to two degrees of each other.
In my rack I use the infrared thermometer to measure hot side UTH with and I use the probe to measure the cool side/ ambient temp.
Just sticking the probe under the paper towels in the tub will not give you an accurate measurement of what the hot sides surface temp really is, like chrid said.

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i have a few of those lil thermometers. their probe only read the surface or air it is in contact with. it doesn't read the whole environment. but alotta peeps actually use these lil thermometers to measure temps of incubating eggs, so it works good. also depending on wear u buy them - an Accurite may only be $2 more then these things and also reads humidity.