Product review (5 stars): Gonna get another one
Bought one of these in early 2014, got 2 1/2 years of accurate readings for outside and crawlspace.
Alerted me several times when I had dehumidifier issues under the house.

I kept the base unit outdoors, exposed to rain and elements (not direct sunlight) and the remote unit hanging in the center of the crawlspace.
About to buy another one as it gave out. $20 for 2.5 years of service is solid.