Perfect for constant temperature monitoring of reservoir or aquarium. "¢ Measures with water proof outdoor probe "¢ Monitors indoor temperature from 32° to 122° F "¢ Monitors outdoor temperature from -58° to 158° F "¢ Display alternates between time and temperature "¢ 12 foot cable with probe "¢ Wall mount or desktop display options "¢ Batteries included 1 AAA