The Matco Tools AC789H R-134a and Hybrid RRR Machine incorporates a full flushing system, eliminating the risk of residual oils from standard 134a vehicles into a hybrid 134a system. The AC789H also includes an automatic oil injection feature for standard 134a vehicles. The automatic oil injection is disengaged when selecting “hybrid” from the start menu. A fully-integrated real "loop" aids in a full flush of service hoses by refrigerant circulation. It includes an updateable refrigerant capacity database of over 1,000 vehicle refrigerant capacities. Other features of the AC789H include automatic vacuum leak tests, automatic oil discharge, automatic air purge, automatic filter alarm, and a low- and full-tank refrigerant alarm. This machine comes with a thermal printer, a large graphic display and a two-year warranty. Certified for compliance with SAE J2788.