Dimensions: 4.75L x 1.5W x 9H in.. Plastic thermometer can be used to gauge water temperature year-round. Helps with proper adjustment of water treatments. Measures temperatures between -20 and 120 degrees F. Includes nylon string for anchoring to accessible location. The Aquascape Submersible Pond Thermometer is an important tool for maintaining and monitoring the health of your outdoor pond, plants, and fish. This fully submersible thermometer will monitor water temperatures throughout the year so you can adjust fish feeding schedules, water treatments, and much more as the seasons change.