SplashTech Pocket Reservoir Pool Thermometer, Large A pool maintenance essential. Alcohol-based thermometer with big, easy-to-read numerals Dual Fahrenheit and Celsius displays. Max high temperatures: 120 F, 50 C Convenient pocket reservoir holds water for out-of-pool readings Tough plastic body sinks for better readings and stands up to daily use and abuse Large, 9.5" x 1.5" profile with 2-degree increments for accurate readings