INFICON AST-ID Automotive Refrigerant IdentifierAST ID Refrigerant Identifier is designed to verify that the refrigerant in a vehicle or cylinder meets the purity standard necessary for use or reuse. This portable tool also reveals the presence of contaminants like hydrocarbons and oxygen, both of which can negatively impact the performance of an AC system. Sample vapor from cylinders or vehicles and identify R1234yf or R134a using AST ID. With SAE J2912 approval and the versatility to be used in