DocKin Classic Fridge/Refrigerator Thermometer, Freezer Thermometer with Large Digital LCD Display,-40&deg;F~140&deg;F Temperature Rang (White) High Accuracy :the high precision sensor probe simultaneously transfer the correct temperature with accurate reading better than 1C at -10~30C Wide Range:DocKin refrigerator/freezer thermometer provides accurate temperature readings range is from -58F~158F(-50C to 70C) Easy to Use: The magnet on rear part can be placed both inside or outside the refrigerator at your most convenient locaton ,it also comes with a 47" long adjustable wire sensor plus 2 pieces sucking disc for better organization Special Design:Round shape with fish-eye design Diameter: 1.97", Thickness: 0.79" A button battery was included