Fangrui Product Details 1. Easy To Use, The Thermometer Comes With A Suction Cup That Can Easily Be Sucked Onto The Surface Of The Fish Tank. 2. Intuitive Digital Display Allows For Easy Understanding Of The Temperature In Water At A Glance. 3. The Display Of Celsius And Fahrenheit Degrees Can Be Switched, And The Highest And Lowest Temperature Memory Values Can Be Viewed. 4. Metal Probe, With Strong Waterproof Grade, Long Service Life, And Strong Anti-interference Ability. 5. Wide Application Range: Suitable For Fish Tanks, Aquariums, Refrigerators, Industrial And Other Fields. Probe Section Wire Length:approximately 94cm Temperature Measurement Range:-5070(-38 158 Accuracy: 1( 1.8 Operating Environment Temperature:-1050(-14 122 Battery Used:1.5v Button Battery (lr44) X 1 (without Battery) Instructions For Use: 1. Fix The Display Screen Part Outside The Fish Tank (the Display Screen Should Not Touch Water), And Extend The Sensing Probe Into The Water. 2. Click The Power Button To Turn The M