Ideal as a Pool Water Thermometer, Pool Spa Thermometer, Hot Tubs, Fish Ponds, Aquariums and All Other Types of Systems.Our pool and hot tub thermometer is made from high-quality, shatter-resistant materials and contains a non-toxic liquid inside. It displays temperature in both Fahrenheit and Celsius.For easy installation and a secure fit, we’ve built a durable and long-lasting tether. The tether helps to prevent it from floating into the skimmer basket or other pool-cleaning equipment.