Accurite specs are Temp +/-2ºC and +/- 15% RH (some are 20%RH) if it is reading 90ºF and 60% it could actually be anywhere between 86ºF and 94ºF and 45%RH and 75%RH some call this accurate, I do not. Every one has their own feelings of what acceptable is I have come to accept 1ºF up or down of correct and 5%RH up or down. Accurites the three I have own two were beyond the specs and returned for replacement. (more than 4ºF off of correct ) The third was just inside the 4º tolerance. I refused to use it and gave it to my dad to keep track on the temp outside the kitchen window he believes it is off as well just by feel. (It is off by 3.5ºF the last time I measured it)

I dislike them and NEVER recommend them, too expensive to buy enough to average them out to get a decent baseline and find the 'wanderers' (5 or greater units ten would be best) and I also do not like batteries INSIDE an enclosure they can leak battery acid and a grab bag of acid gasses. neither of which I want in my enclosed system my snake lives in.