A lot of people and I use the Acu-Rite from Walmart. They are only $12.00 and you can mod them so both the IN and OUT temps. and the humidity sensor are on leads and can be placed in two different tubs or both in the same tub, one on the hot spot and one on the cool side and the humidity sensor in there with the thermometer out of the tub. You can find the modification post in the DIY section.
Here's the thermometer.
And here is a pict. of one I modified.
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