Easy to use Immerse the probe in the fish tank to measure the water temperature (Submerge probe only, do not immerse the thermometer in water). Use easy to install LR44 batteries.Wide Range & Precise Range Temperature Range: -40C~70C. Temperature Accuracy: 1C. Temperature Display Resolution: 0.1C.Satisfaction Customer Satisfaction If you have any problem or suggestion, please contact our customer service. Our service team is always ready to help you. You can get a full refund if you are not satisfied.Size Dimension: 4.8 x 2.85 x 1.52 cm/ 1.9 x 1.1 x 0.6 in. LCD screen dimension: 4 x 1.7 cm. Installation dimension: 4.6 x 2.7 x 1.4 cm/1.8 x 1 ,1 x 0.6 in. Sensor cable length: 1.5m/59.1in. It can test the temperature of some special places.