H-B DURAC Bi-Metallic Dial Thermometer; 10 to 150C (50 to 300F), 1/2 in. NPT Threaded Connection, 75mm Dial (B61310-7400) Bi-metallic dial thermometer has 3" dial diameter with readings in Fahrenheit and Celsius for industrial applications 1/2" NPT threaded connection for industrial installations and pipe lines Choice of 2"/50mm stem length for use with liquids, or 4"/100mm stem length for use with liquids or gasses Stainless steel case and stem provides durability, and polycarbonate lens has external adjustment feature to ease field calibration Includes Statement of Test and Calibration