Product review (4 stars): and so keeps me much better informed than I otherwise would be unless I opened ...
Works as described, but a few early-stage software glitches remain to be addressed.  The device does display conditions inside instrument cases, and so keeps me much better informed than I otherwise would be unless I opened each instrument case and checked manually.  Checking the Humiditrak app is much more convenient, and I do it far more often that I would actually check the cases by hand.  I own 4 sensors, and will likely buy more.  A useful product.