The Mastercool 55900 IntellaSense II Refrigerant Leak Detector employs a low power metal oxide gas sensor with superior performance properties, including lower current consumption and sensor longevity. The sensor is characterized by high sensitivity and fast response upon detecting the presence of extremely small levels of chlorofluorocarbon gases.In addition, integrated into the design of the 55900 Leak Detector is a powerful microprocessor that automatically selects the best operating condition for the sensor, ensuring optimum performance throughout the life of the sensor. The 55900 Leak Detector furthermore was designed to meet J2791 (R134a), J2913 (R1234yf) and EN 14624.