Product review (1 stars): Junk
Bought this to put under the house to see if crawlspace was getting too humid. The indoor sensor works well but the external sensor was reading 20 degrees higher and about 30 percent higher humidity. I had to pay asomeone to crawl under the house and install it, and again to retrieve it when it was clear it didn't work. No way it was 80 under the house when it was 60 degrees outside overnight. I called customer service and they had me keep trying different batteries. Finally after two different brands and 4 sets of brand new batteries, we got the two to read similar (3 degrees and percent off) when sitting next to each other. Customer service said that was acceptable to them. Decided to let it sit for a few days to make sure it worked before trying under the house, and within 48 hours the light was blinking that the batteries were low. Once we threw it away we realized it had been the source of much cell phone and tv remote interference.