The Robinair RG3000 is a light weight (18 pounds) portable Refrigerant Recovery machine. It has a oil-less compressor and can recover refrigerant in both the liquid and vapor states. It works with all the refrigerants R-22, R-134a, R-410a.
It has automatic shut offs when a HVAC system reaches 0 psi when recovering. It also has automatic shut off when purging the unit.
This is good small and economical recovery machine, for a busy shop something larger might be recommended.
Robinair RG3 110V AC, 60 Hz Portable Refrigerant Recovery Machine
I have used this a few times now and it has worked great so far. The compressor, vacuum pump works faster than the units I have used in the past. It is also smaller than I was expecting and lighter but feels well built. This is the most economical recovery machine I found to date, and I will not say it is the best one made but has served me well so far and I believe will continue to do so. I will update the review if it fails or if any other problem comes up with it.