Product review (4 stars): Not adjustable, as advserised
Bought three and placed them side-by-side for weeks.  Temp readings are within a degree and close enough for me.  Humidity percent readings within 4 units.  Backsides are not flat so they are not suitable for hanging on a wall.  Also may not be suitable for inside an instrument (guitar) case.  Knew all that when I bought them so no complaint.  But I took one apart one and I was disappointed that nothing inside is adjustable.  The cost of a part or two should be minimal so I don't understand why not.