LED-TP-HWT Hot Water Thermometer Hot Water Thermometers are suitable for use innumerous applications that require an accurate temperature readings, such as in the HVAC industy for hot water lines, boilers hydronic heating, etc. STANDARD FEATU RES In galvanized steel SHELL: Glass POINTER: Balanced, lightweight aluminum with matte black or red finish IHERMETICAL SEAL: The Hermetical-seal case offers protetion from weather and dust, and is guaranteed against fogging up. Copper alloy PROTECTION: Copper alloy thread of the protection: 1/2" NPT or 1/2 BSP TEMPERATURE RANGES 0-120~C / 30-250~F +1.5% CALIBRATION: Mercury in glass thermometer grade II standard