The Aqua One Easy Read LCD Stick On Thermometer is a compact and user-friendly device designed to monitor aquarium temperatures externally. It features a clear LCD display that shows temperatures ranging from 0°C to 37°C (32°F to 99°F) and includes a high/low temperature alarm with visual and audible indicators. This thermometer is powered by a non-replaceable battery and adheres securely to the exterior of a glass aquarium, making it suitable for both freshwater and marine setups. It's ideal for hobbyists seeking a straightforward and reliable method to track their aquarium's temperature.