The Laguna Floating Thermometer is a fast and convenient way to keep you informed about the water temperature. Pond water temperature is an important factor that influences the overall condition of your pond as well as the health of your fish. The thermometer includes an easy viewing window with large temperature indications for quick readings. It comes with a handy anchoring cord and is designed to float on the water surface for easy access. The Laguna Floating Thermometer records temperatures between 30 to 120-degree fahrenheit and its light, all-plastic construction is fish friendly and will not rust.