Kemp USA carries two types of Pool Thermometers. One is a large standard 10" thermometer that mounts to the side of the pool, the other is 8.5" thermometer that floats in the water. They measures pool and spa temperature with accuracy. They both have a large temperature display and reads up to 120 Fahrenheit and 50 Celsius. Made of durable and shatter resistant ABS Plastic material. Great for all outdoor and indoor pools, spas and hot tubs.