Usage Steps: First press the PWR button of the aquarium thermometer, then put the sensor probe into the water; Note: Please do not put the thermometer into the water, only put the immersion probe into the water. Temperature Measurement: The digital aquarium thermometer can read a wide temperature range from -50C to +70C, and can range from -10C to +50C depending on the working environment. Strong Practicality: The suction cup can attach to the surface of the terrarium and aquarium. The LCD screen is clear. The temperature can be accurate to 0.1 degree. Powered by an LR44 button cell (already placed in the thermometer). Compact Design: The connection cable 98cm long, so enough space between the immersion probe and the temperature LCD screen, Protect electronic components from moisture. Widely Used: Digital thermometers are suitable for aquariums, reptile boxes, incubators, can protect reptiles, fish and small animals from dangerous temperatures.