Weiss Instruments HWBM25 Hot Water Bimetal Dial Thermometer is furnished with a 1/2" removable socket and 2-1/2" dial size. The temperature range is 32 to 250° Fahrenheit and Celsius. Applications: These quality thermometers, used extensively by the HVAC industry for small boilers, tanks, pipes, etc. offer accuracy and reliability at an economical price.