Elitech GSP-6Pro GLE/THE Temperature Data Logger Humidity Recorder Temperature Monitor.  Can be accessed via bluetooth and an app on iphone or android or via software through USB to a Windows PC or Mac.  I'm listing these as used, I bought them to integrate into a refrigeration system I am building, but they won't work for that project so I am selling them.  2 available.  If you want both you can have them for $25 each.  NOTE: You must contact me before buying so I can send you a combined invoice for $50 for the 2.