RobinAir's InfraRed Refrigerant Leak Detector, No. 22791, provides an advanced infrared sensor designed to last a minimum of 10 years. This product automatically recalibrates in highly contaminated areas to help pinpoint the exact location of the leak. The detector won't trigger on oil or moisture, and senses CFC, HFC and HCFC blend refrigerants. A visual alert and peak button make it easy to find leaks in noisy environments. The device includes three sensitivity levels and responds in less than half a second. Comes with an 8-hour lithium ion battery lasts all day long and beyond.