DECORATIVE DERBY DUCK POOL THERMOMETER: The GAME Derby Duck Spa and Pool thermometer is a durable and easy-to-read pool thermometer designed as the iconic Derby Duck. LARGE, EASY-TO-READ NUMBERS: This floating temperature gauge features large, easy-to-read numbers that allow you to determine the temperature of your pool, spa, or bathtub. SHATTER-RESISTANT: 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.