[Large Floating Pool Thermometer] eLander Pro Water Thermometers, for Outdoor & Indoor Swimming Pools, Spas, Hot Tubs, Fish Ponds Measures pool and spa water temperature and provide accurate reading Extra Large temperature reading display, in Fahrenheit and Celsius. Reads Up to 100 Fahrenheit and 40 Celsius Premium quality, Built from Durable Material & Shatter Resistant For All Outdoor & Indoor Swimming Pools, Spas, Hot Tubs, Aquariums & Fish Ponds