QE QUALITY wall thermometers are used in freezer and cooler applications with temp. ranges -40 to 120 F (-40 to 50 C), relative humidity range 0% to 100%, temp. accuracy +/- 2 degrees, humidity accuracy +/- 7%, housing material/case: ABS, polycarbonate lenses, 2 degree division, include attached wall bracket, and are individually packaged.