Usage Steps: First press the PWR button of the aquarium thermometer, then put the sensor probe into the water; Note: Please don’t put the thermometer into water, only put the water immersion probe. Temperature Measurement: The digital aquarium thermometer can read a wide temperature range of -50°C to +70°C, and can range from -10°C to +50°C 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 one LR44 button battery (already placed in the thermometer). Compact Design: The connection cable 98cm long, so enough space between the dip probe and the LCD temperature display, 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.