The DHS24C-FM High Performance Heat Spy features superior accuracy and sensitivity between -20 to 550°C. Factory Mutual Approved. Accuracy is ±0.3% of full scale. Repeatability of ±1°F. LED Display. Anti-reflective filter for accurate use in strong sunlight or other light sources. Applications include all normal materials, including glass surfaces. The DHS24 is not affected by IR heaters, carbon dioxide or water vapor, and will not measure through glass. 8 to 14 Microns. Enclosed Optical Sight. 3 Year Warranty. Includes Carrying Case, Batteries, Owner's Manual, Trigger Lock, AC Adapter, 110V or 220V.