Identify 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 AccuProbe™ IR the ability to locate a leak of any size.