The Acu-Rite wireless thermo-hygrometer has a base unit and a wireless remote unit that measures temperature and relative humidity. Place the remote unit in the crawl space and monitor temperature and humidity conveniently from inside the home with the included base unit.
Only 1 base and remote unit can be used per location as all of these units operate on the same frequency.
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Would payed extra for unit with light! Unit is working like it should.
I have these in all of my rental properties with the remote sensor in the crawl space. It gives you a accurate reading at a quick glance