A stream thermometer is one of the most valuable items a trout angler can carry, as trout feed actively at water temperature from 50 to 65 degrees. Bass, saltwater flats and other anglers are learning the value of knowing water temperature, and how this affects the species they are pursuing. This thermometer reads from -30 to 50 degrees Celsius and -20 to 120 degrees Fahrenheit. The case is made from metal, includes a split-ring for attaching to a vest, and a pocket clip. The length is 6 3/8".