I personally don't like accurites they are no better than most of the other cheap digitals on the market and are over priced for what they are. The problem especially with people whom decided to use hydrofarm T-stats is they are so inaccurate that having a reasonably accurate thermometer is paramount. (I have hydrofarms over 4ºF from correct) I personally would NOT recommend them accept as a fail safe. Ranco or Johnson or VE100 if you must go on off but the base herpstat is so close it is silly to save 25$ on a ranco. I would suggest that multiple thermometers are needed (3 min and 5+ is better) they can be checked against each other and the incorrect ones discarded.

I like the ESU thermometers that you can often find on ebay for 3$ They are 'cheap as chips' and if you buy as many as the cost of one accurite you get 3-5 in the us but here you get end up with a lot more units and in my experience 2-3 will be off the rest basically the same.

http://www.ebay.ca/itm/Digital-Water...ht_2971wt_1165
or
http://www.ebay.ca/itm/Mini-Digital-...ht_4141wt_1398

The second ones also are hygrometers they are fine too I don't trust digital hygrometers to be correct for long so I have some but tend not to trust them. This unit is ONLY metric that isn't a big problem for me as I know both by heart.

My choice of hygrometers are these

http://www.amazon.ca/Brass-Analog-Hy...0221116&sr=8-4

They have a metal face card (unlike pet store ones) and are calibratable a simple 'salt test' can verify the accuracy and correct it if needed. Out of the box the 20 or so I own all were in 3%rh as the test is only good for 1% accuracy that is very good. The three accurites out of the box the best was 7% and the worst was 20 something off. I think I paid 45$ for the accurite here I returned it (back to cheney) got a replacement paid duty and it too was beyond the allowable specs, returned it (paid shipping) and got a third was just inside the 20% up or down RH and 2ºF up or down so I ended up giving it to my father.