Features: A digital thermometer with a high-precision temperature sensor on the back can be attached directly to the outside of the fish tank. The measured temperature range is about 0-70 C, and note that there may be a 0.1 C error. With LED digital display, temperature measurement, can accurately measure the temperature of fresh water, sea water and other different water quality. Remove the removable film and attach the thermometer below the water . There are buttons to set maximum and minimum temperature. Package Includes: 1x LED Digital Aquarium Thermometer Specifications: Material: Electronic Components Size: Approx.5.7x8cm/2.24x3.15in Color: White, Black(optional) note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.