For ambient temps I would recommend http://r.ebay.com/QZdKB7, for UTH temps I use http://www.reptilebasics.com/pe-2, for humidity I would recommend http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1, the hygrometer can be easily calibrated by doing a salt test.
http://www.youtube.com/watch?v=d7Ap96SlGZA
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