eLander [Large Floating Pool Thermometer] Pro Water Thermometers, for Outdoor & Indoor Swimming Pools, Spas, Hot Tubs, Fish Ponds Measures pool and spa water temperature and provide accurate reading Large temperature reading display, in Fahrenheit and Celsius. Reads Up to 120 Fahrenheit and 50 Celsius Premium quality, Built from Durable Material & Shatter Resistant For All Outdoor & Indoor Swimming Pools, Spas, Hot Tubs, Aquariums & Fish Ponds