The Neutronics Mini ID Refrigerant Identifierfor R-134a helps techs to quickly verify the presence and quality of R-134a refrigerant in vehicle A/C systems. The Mini ID automatically provides step-by-step indication of the gas sampling process. "Pass" and 'Fail" lights clearly show if refrigerant is pure enough to be recovered. The Mini ID can identify unknown refrigerants, such as illegal blends, propane or butane, and even uncover hard-to-find air contamination.