Provides an economical and accurate method to measure surface temperatures on a 1/2" to 4" pipe. Clamp-on design with steel spring. Dual scale. Easy to install. Applications: to measure surface temperature on pipe in the heating, ventilation, air conditioning, wastewater, industrial process markets. Dial: 2-1/2" aluminum with black markings. Case: mild steel. Lens: plexiglass. Ring: steel, chrome plated. Sensing element: bi-metallic coil. Pointer: aluminum, painted black. Over-range enclosure rating: 25 Percent of full scale value. Ambient/process temperature: -40 degree F to 390 degree F. Accuracy: +/-3 Percent of full scale. Enclosure rating: IP52. Temperature range: 30 Degree F to 240 Degree F.