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 -50°C to +70°C, and can range from -10°C to +50°C according to 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 a LR44 button cell (already placed in the thermometer).Compact Design: 98cm long connection cable, so enough space between the immersion probe and the LCD temperature display, Protect electronic components from moisture.Widely Used: The digital thermometer is suitable for aquariums, reptile boxes, incubators, can protect reptiles, fish and small animals from dangerous temperatures. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin