Product Description Reliable and good-working thermometer for your fish tank or terrarium. Easy-to-read LCD display allows you to get temperature readings easily. You can freely switch the unit between Fahrenheit and Celsius.Digital C / F thermometer;Temperature range -50c ~ + 70c,Operating temperature -10c ~ +50c. aquarium thermometer can easily be set in minutes. Simple mount main display unit over the tank And place the sensor probe inside the water Digital aquarium thermometer helps to monitor the water temperature of your fish tank so that you can make proper adjustments to it, protect fish from diseases. With our thermometer, you can quickly and accurately read the water temperature of your fish tank, ensure the right temperature and keep your pet fish healthy. Reliable and good-working thermometer for your fish tank or terrarium. It can be used for a wide range of aquarium and water tanks such as fresh water, tap water, salty water, marine water and etc. Furthermore, it is also a great tool for monitoring the living temperature for your reptile such as lizard, turtle etc. Features: Temperature Range: -58 F to +158 F (-50 C to +70C) Operating temperature: -10~+50 (14~122) Resolution : 0.1C Accuracy : +/- 1C Switch between C and F Battery: DC 1.5V LR 44 button battery Sensor probe cable length: Approx. 3 feet (1 meter) Item Dimension: approx. 2.3 x 1.5 x 0.6 inches (5.8 x 3.8 x 1.5 cm) Compact design with 2 suction cup mounts. Installation and operation is easy. Simply attach the display outside of the fish tank using the suction cups, then submerge the probe into the water. The LCD display will now show the temperature accurately. It is operated by two button batteries. Operation: Open the battery cover and insert battery with (+) positive side up. The LCD will now display the current room temperature. Attach the display unit to the outside of the tank using the suction cups and submerge the probe into the water in the tank. Press and hold the power (pwr) button to turn on. Hold the power button for 3 seconds to turn off. Package Contents: 3 x Digital Thermometer 3 x Battery 3 x Probe