Product review (5 stars): Small size, works great for me!
Just received this, and so far it is working perfectly.  Pairing to multiple iOS devices was easy.  It fit nicely in the case.  Communicates over Bluetooth easily over 35 feet. App works well, and I received a low-humid notification this morning.  The app stated there was an important update coming soon, so I hope things get better for those who have problems.  Cant really comment on accuracy, yet, but the numbers it is reported seem very believable to me.  Love being able to check on my guitars without opening their cases!