YLJ 68961 Refrigerant Analyzer for R-12, R134a and R-1234yfService R 12, R 134a and R 1234yf vehicles with one tool. With the introduction of the new HFO 1234yf refrigerant to the automotive market, vehicle manufacturers worldwide have developed new standards for vehicle A C service. Included in these standards is the requirement to verify the purity of the refrigerant prior to recovery of the refrigerant in the system. INCLUDES: R 1234yf & R 134a low side service couplers R 1234yf & R 134a cylinder adapters