A halogen leak detector is a specialized, handheld electronic device designed to detect minute traces of halogen-based gases, specifically CFCs (R-12), HCFCs (R- 22), and HFCs (R-134a/R-410A) used in HVAC/refrigeration systems. Using sensors like heated diodes or corona discharge, these tools emit audible and visual alarms to pinpoint leaks in air conditioning, heat pumps, and automotive systems