Material: ABS Measuring range: -50 C + 70 C; Resolution: 0.1 C Accuracy: 1 C Operating environment temperature: -10 C ~ + 50 C Power: DC 1.5V button battery (LR44/AG13) (included) Machine size: About 58*37*16mm/2.28*1.46*0.63inch Display size: About 26.5*13.5mm/10.43*5.31inch Probe part line length: about 90cm / 35.43inch Weight: 34g/pcs Quantity: 1 pcs Instructions for use: 1. Fix the display part outside the fish tank (the display can't touch the water) and extend the sensor into the water. 2. Press the power button to start displaying the temperature. If you need to turn off the power, press and hold the power button for 3 seconds. 3. The display shows HC indicating that the measured temperature is higher than 70 C, and the display shows LC indicating that the measured temperature is lower than -50 C.1Easy to read : With compact design ,The Large LCD display unit is easy to read. 2°F / : It records a wide range of temperature can be read in Celsius or Fahrenheit, which makes it exceptionally useful in that you can use it in any kind of fish tank. 3Precise : Displaying temperature measurements within 0.1 degrees! And has a temperature range from -50 to +70 degrees celsius. 4Easy to set up : This thermometer comes with two parts that have suction cups that simplify the mounting process. 5Stylish appearance: Small and exquisite, powerful suction cup can be absorbed on any smooth surface, especially the aquarium, above the refrigerator. 1 x Aquarium thermometer 1 x Button cell battery