Hc520 Basic functions description Temperature range in side: -10 ~ 50c (14 ~ 122f) out side: -50 ~ 70c (-58 ~ 158f) Accuracy +/-0.1c or +/-0.2f Humidity range 20% ~ 99% rh Accuracy +/-5%rh Resolution 0.1c/1%rh Store condition -20c ~ 60c,20% ~ 80% rh Product size 98x78x17mm Product weight 95g (90g) Power supply aaa1.5v x 2 Special functions Memory of last measurement In and out temperature measuring Min. And max. Value recording Desk-top placing or wall hanging Frost alarm between -1 ~ 4 c C/f can be select Htc-1 Basic functions description Temperature range -50 ~ 70c (-58 ~ 158f) Accuracy +/-1c or +/-1.8f Humidity range 10% ~ 99% rh Accuracy +/-5%rh Resolution 0.1c/1%rh Store condition -20c ~ 60c,20% ~ 80% rh Product size 98x78x17mm Product weight 90g Power supply aaa1.5v x 2 Special functions Min. And max. Value recording C/f can be select 12/24 hour clock system Hour alarm Daily alarm clock Calendar display