1. Easy to use, the thermometer comes with a suction cup that can easily be sucked onto the of the fish tank. 2. Intuitive digital display allows for easy understanding of the temperature in water at a glance. 3. The display of Celsius and Fahrenheit degrees can be switched, and the highest and lowest temperature memory values can be viewed. 4. Metal probe, with strong waterproof grade, long service life, and strong anti-interference ability. 5. Wide application range: suitable for fish tanks, aquariums, refrigerators, industrial and other fields. Probe section wire length:approximately 94cm Temperature measurement range:-50℃-70℃ (-38 ℉-158 ℉) Accuracy:± 1℃ (± 1.8 ℉) Operating environment temperature:-10℃-50℃ (-14 ℉-122 ℉) Battery used:1.5V button battery (LR44) x 1 (without battery) Instructions for use: 1. Fix the display screen part outside the fish tank (the display screen should not touch water), and extend the sensing probe into the water. 2. Click the power button to turn the machine on and off, and and hold to switch the temperature display unit to ℃/℉. Click the MAX/MIN button to view the highest and lowest temperature memory values; In the highest and lowest value interface, long to clear the memory. 3. Two suction cups are included in the packaging, which can be fixed to the body hanging hole and one end of the probe as needed. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:Black Material:Plastic Package Contents: 1 x Digital Aquarium Fish Tank Thermometer With Suction Cup Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.