SIMPLE DESIGN - The aquarium thermometer is an attractive yet simple unit to design, without overly complicated controls. The unit itself is blue and has a clear plastic border around the edges. WATERPROOF - The aquarium thermometer is completely waterproof, you can put it in the aquarium, real-time monitoring of water temperature VERY SIMPLE TO USE - No instructions needed. This is the simplest aquarium thermometer on the market, with no buttons to operate. SUCTION PAD FOR EASY PLACEMENT - Simply find the best spot in the fish tank, then attach the unit with the small suction cup that will hold the thermometer in place until removal is required. WIDE RANGE - The temperature range is -58F to 158F, allowing you to use this aquarium thermometer in most temperature conditions. Features: 1. LCD display, simple operation, small and compact size. 2. Special waterproof design, submersible. 3. Built-in sensor, no sensor wire required. ; 4. Strong suction cup can make it stick firmly to the aquarium inside wall, making temperature measurement much more accurate and convenient. Specifications: Temperature reading range: -50 ~ +70 C Accuracy: 1 C Working temperature: -10 C ~ +50 C Temperature reading within 0.1 C Button battery: Button battery (DC1.5V included) LR44 Dimension: 45 mm x 55 mm x 28 mm (approx.) LCD size: 27 mm * 13 mm (approx.) Package included 1 Aquarium Thermometer