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zilla makes a pretty good one for $20. it has a separate senders for temp and humidity on generous 56" leads. records highs/lows of each. bear in mind the sensor for the humidity needs to be out of the direct stream of water, in order to measure the humidity, so you need to secure it under a leaf or something. i have bought several different models over the years but the zilla has been my favorite.
in technical terms, measuring humidity is problematic, especially where digital ones are concerned. there are actually several different types of hygrometers and ways of measuring humidity. a chilled mirror is one of the more accurate types, but relatively expensive and rather bulky, and needs cleaning regularly so not well suited for cham cages.
as far as relatively economical ones that are well suited for cham keeping, i vote zilla. i have a couple i have had for over 5 years with no problems.
there is a pic of one in post #6 of this thread
https://www.chameleonforums.com/digital-thermometer-hygrometer-brand-41517/
I use and like this one very much. I got it for $4 at Lowe's. I usually go to stores like that for this kind of thing.
http://www.songbirdgarden.com/store/scripts/prodView.asp?idproduct=5647