The Valterra Blue Devil floating submersible thermometer with cord is designed to provide easy water temperature monitoring in pools, spas, and similar water environments. A floating thermometer is useful because it keeps temperature readings accessible without requiring the user to handle complicated equipment or permanently mount a sensor in place.This model is especially useful for buyers who want the convenience of a floating design along with the added control of a corded format that helps keep the thermometer positioned where they want it. That can make retrieval easier and keep the unit from drifting out of reach.The B8155 is a practical choice when dependable, easy-to-check water temperature readings are part of regular pool or spa care. Valterra Blue Devil floating submersible thermometer with cord Designed for easy water temperature monitoring Floating format keeps readings accessible Cord helps control placement and retrieval Useful for pools, spas, and other water environments