Visol Modern Rectangular Digital Hygrometer Digital Hygrometer with Precise Readout; Rectangular Shaped with Pop Up Stand in the back; Shows Digital Temperature; Battery Included (G13A Micro Cell 1.5 V Alkaline Button Cell); Three Black Button on the Back for Calibration (C = Reset, + = Max/Min, - = C and F) 3.4 inches (Length) x 1.95 inches (Width) x 0.3 inches (Thickness); Approx. Weight: 0.125 pounds; Included Magnetic Plate with Adhesive; Can be Easily Attached to Any Cigar Humidor; Made with Plastic; Battery can be Easily Changed; Large Frame for Easy Reading Comes Packaged in Cardboard Box