The wireless 2-in-1 digital aquarium thermometer allows you to accurately monitor water and room temperature simultaneously.. Features. 2-In-1 design measures and communicates water and room temperature within 2 f 1 c. Large, easy-to-read lcd display. Wireless easily mounts to aquarium exterior glass with no need for probes or messy wires. Celsius or fahrenheit temperature selection. For use in freshwater and saltwater aquariums