Personally I am not a fan of accurite they are quite poor accuracy (some are rated at 2ºC up or dow from correct... that is just under 4ºF) this is to far IMO. I also do not like having batteries inside the enclosures they can leak and have nasty out gassing when they do. I prefer a cheap thermometer for aquariums. They are poor accuracy but at a few dollars it is easy to buy a handful they can be tested against each other the average can be guessed to be reasonably close to accurate and the others discarded.
http://www.ebay.ca/itm/Mini-Aquarium...ht_2371wt_1165
This model is specd at +/- 1ºC twice as accurate as some of the accurite models.
Hygrometers in digital land are fussy rigs you ca see the sensor on Aaron's great pics it is a squiggly carbon pad. If ANY dust dirt or other junk gets on that pad it changes the accuracy. I used to use and test digital ones (cigar hygrometer test kits) and found they came ok (5% RH from accurate) and quickly became inaccurate (the worst I have tested was more than 30% off it had a damaged probe wire)
As a result of my frustration I spoke to a cigar aficionado I know and was pointed at the analogue cigar box hygrometers. I tested and have been using them and discovered that they are out of the box better than 2%RH accuracy and if they become incorrect a simple 'salt test' can be used to correct it. They seem to be unaffected by dust dirt and general junk.
http://www.amazon.com/Analog-Hygrome...rometer+analog
The total of the two is about the same price of the (in) accurite one so many prefer. If you follow my suggestion it is likely you will have accuracy greater than the any accurite I have ever tested.