Yellow Jacket 69320 AccuProbe IR Leak Detector with Infrared Sensor Use the infrared (IR) sensor for ultimate sensitivity, accuracy and reliability Identifying the smallest leaks is fast and easy. The YELLOW JACKET AccuProbe IR detects all CFC, HCFC, HFC and HFO refrigerants, including R-134A, R-404A, R-410A and R-1234YF. The SmartAlarm LED shows the size of the leak on a rising scale. Coupled with two modes for sensitivity gives the AccuProbeÄ IR the ability to locate a leak of any size.