The Extech IR300UV Infrared Non-Contact Thermometer with UV Leak Detector professional 4-in-1 instrument features a non-contact Infrared Thermometer, UV Leak Detector, bright Flashlight, and a unique coaxial Distance-to-Spot guidance laser. The IR300UV combination meter helps you take quick temperature readings on unsafe surfaces, while the circular laser shows you the area being measured to maintain accurate measurement distance. Its UV light easily reveals refrigerant leaks in combination with a standard UV dye (not included) on AC units, pipes, and automotives. Convenient built-in bright flashlight will help you do your job in dark environments.