Visol Modern Large Circular Digital Hygrometer Digital Hygrometer with Precise Readout; Color Coded Humidity Marker (Green showing Ideal Humidity); Shows Digital Temperature; Battery Included (CR2032 3.0 V Lithium Button Cell Battery); Crescent Shaped Button on the Front to change between F and C 2.9 inches (Diameter) x 0.55 inches (Thickness); Approx. Weight: 0.11 pounds; Included Magnetic Plate with Adhesive; Can be Easily Attached to Any Cigar Humidor; Made with Plastic; Battery can be Easily Changed; Large Circular Frame for Easy Reading Comes Packaged in Cardboard Box