With the large, easy-to-read digital display of the JUWEL Digital Thermometer, you can easily keep an eye on the temperature in your aquarium. In a temperature range from 16 to 42°C, water temperature is measured with accuracy of +/-1°C. Despite this accuracy, the digital thermometer battery has a relatively long life of up to a year. The JUWEL Digital thermometer is suitable for use in both freshwater and saltwater aquariums.