The Mastercool 55800 IntellaSense Refrigerant Leak Detector employs a metal oxide gas sensor for the detection of chlorofluorocarbon gasses and blends. This tin oxide sensor is characterized by high sensitivity and a fast response, upon detecting the presence of extremely small levels of chlorofluorocarbon gases.Integrated into the design of the 55800 Leak Detector is a powerful microprocessor that automatically selects the best operating conditions for the sensor, to ensure optimum performance. The optimum sensor performance is maintained and monitored throughout the life of the sensor. The 55800 Leak Detector furthermore meets and exceeds J2791 (R134a) and J2913 (R1234yf).