The Refrigerant Leak Detector detects all CFC refrigerants such as R-22, R-124, R-11 and R-12. The ultra-sensitive long life sensor detects the more current, difficult-to-detect HFC refrigerants such as R-134a, R-404A, and new R-22 replacements, R-410A and R-407C. The Refrigerant Leak Detector’s long, slim gooseneck probe design is easy to use in close areas and for extending into hard-to-reach areas. It’s adjustable alarm, easy one-hand operation and impact resistance storage case add up to value and convenience