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). Uses easy-to-install LR44 batteries. Wide range and precise temperature measurement: -40°C to 70°C. Temperature accuracy: ±1°C. Display resolution: 0.1°C. Customer satisfaction: If you have any problems or suggestions, please contact our customer service. Our service team is always ready to assist you. Full refund available if not satisfied. Dimensions: 4.8 x 2.85 x 1.52 cm (1.9 x 1.1 x 0.6 in). LCD screen size: 4 x 1.7 cm. Installation dimensions: 4.6 x 2.7 x 1.4 cm (1.8 x 1.1 x 0.6 in). Sensor cable length: 1.5 m (59.1 in). Can measure temperature in hard-to-reach locations.