1. Easy to use, the thermometer comes with a suction cup that can be securely attached to the surface of the fish tank. 2. Intuitive digital display allows for quick and clear reading of water temperature. 3. Switchable between Celsius and Fahrenheit; displays maximum and minimum recorded temperatures. 4. Metal probe with high waterproof rating, long service life, and strong anti-interference performance. 5. Wide application range: suitable for fish tanks, aquariums, refrigerators, and industrial environments. Probe wire length: approximately 94 cm Temperature measurement range: -50°C to 70°C (-58°F to 158°F) Accuracy: ±1°C (±1.8°F) Operating environment temperature: -10°C to 50°C (14°F to 122°F) Battery: 1.5V button battery (LR44) × 1 (battery not included) Instructions for use: 1. Attach the display unit outside the fish tank (display must remain dry), and submerge the probe in water. 2. Press the power button to turn the device on or off. Press and hold to switch between Celsius and Fahrenheit. Press the MAX/MIN button to view recorded high and low temperatures; hold the MAX/MIN button to reset memory. 3. Two suction cups included for flexible mounting options. Note: Product design or color may vary slightly between batches; such variations do not affect functionality. Color: Black Material: Plastic Package contents: 1 × Digital Aquarium Fish Tank Thermometer with Suction Cup