Marina LCD Mini Digital Aquarium Thermometer

Liquid Crystal Stick On Digital Thermometer.  Accurate and simple to read, sticks on outside glass.  removable.  Reads 18-30 degrees Celsius, or 64-86 degrees Fahranheit.  Green indicates the correct temperature.  If green is not visible, the correct temperature is halfway between tan and blue.  Keep away from direct sunlight.  Dimensions .75" X 1.75"