Product review (4 stars): Device probably saved me big bucks.
Decided on this model because I want to place the remote sensor in the crawl space. What was first put in place, it read 68 degrees F and 53% relative humidity. Over the three months the temp registered close to the outdoor temperature and the humidity monitor remain 50 to 55%. Just before Thanksgiving the humidity monitor was 99% when I checked it in the morning. An inspection of the crawl space revealed a leak in the hot water line. Once the hot water was turned off, the repair was simple and took about an half hour. It took about 4 days venting the crawl space before the humidity was back down to the mid-50s. Is this unit alerted us to the problem thus preventing extensive damage. That was a good buy for us and I would recommend it for anyone that wishes to or needs to monitor relative humidity in a hard to get at area.
Better yet would be a unit with at least two remotes and an alarm. The alarm could be set so that immediately you would know when something has gone wrong and the second remote could be placed anywhere. In my case my crawl space has two sections because of an add-on to the house. That's where the second remote would be put.
I plan to shop for a unit like that with an alarm and 2 or more remotes. If I cannot find one at a reasonable price then I will buy another one of these for the other crawl space section.
I rated 4 stars vice 5, not because of its performance, but because the readout should be lit so that it can be read easily from anywhere in the room.