Poolmaster 52558 18" Black Clock, Thermometer and Hygrometer. Simple, classic design for outdoor or indoor use. Durable 18″ metal frame with white baked enamel finish surrounds this 3-in-1 clock with glass lens. Featuring clock, thermometer, and humidity indicators, this classic beauty adds a touch of chic to any room or patio. Large easy-to read roman numerals. Requires 1 AA battery – not included.