For the most efficient refrigerant recovery machine, the Robinair R-134A should be your go-to product. This is because it has an advanced display that will show you the need to replace oil and the amount required. There
is an automatic refrigerant refill feature that maintains a user-selectable amount in an internal vessel and signals when it’s time to change the supply tank. This machine is equipped with vacuum leak test monitors to inform you of possible leaks without operating panel valves. Besides, there is an audible and visual alarm that will notify you when service is complete or if a problem occurs.