About this item Wireless Design: Stick-on Induction Thermometer senses water temperature through probe, wireless design, no messy wires in the water, providing a clean and safe environment for fish. Easy to Read: Comes with a large LCD display that is easy to read clearly. Dimension: 2″Lx 1.4″W x 0.4″H Temperature Range: Measure 14°F to 122°F (-10°C to 50°C) with accuracy /- 1°C Wide Application: Ideal for aquarium terrarium, or vivarium, suitable for different water types such as fresh water, tap water, salty water, marine water and etc. Free Battery: 1 PC LR1130 button cell battery for each thermometer.