In the U.S., some HVAC technicians are finding that their old leak detectors cannot handle the many new ozone layer-friendly refrigerants approved under the federal EPA’s Significant New Alternatives Policy (SNAP). All of General’s American-made refrigerant leak detectors use a proprietary semiconductor sensor to detect most commercially available HFC, HFO, HC, HCFC and CFC refrigerants. Our newest model, the RLD440 Refrigerant Leak Detector, goes one step further by complying with all five worldwide refrigerant detection testing standards