Product review (5 stars): Read Temperature and Humidity in four locations.
I have one sensor in the attic keeping an eye there so I know when to turn the fan on so it doesn't get too hot in the summer and ruin my roof. I have another sensor in the basement keeping an eye on the humidity and temperature so I know when to run my dehumidifier so I don't waste electricity. I have the third sensor outside so I can see temperature and humidity there for obvious reasons and of course the base unit reads local humidity and temps so I know how comfortable it is in the house. One base unit reads four locations.