Oregon Scientific makes the model THT 312 digital thermometer with built in alarm clock. It is perfect for constant temperature monitoring of reservoir or aquarium. "¢ Water proof outdoor probe "¢ LED backlight "¢ 12 hour clock with alarm "¢ 10 foot cable with probe "¢ LCD displays time, indoor & outdoor temperature simultaneously "¢ Batteries not included (Requires 2 AAA)