Vevor Single Cylinder Refrigerant Recovery Machine

[leonardclenin]

Hello, I am looking into Vevor's refrigerant recovery machine (single cylinder type) and would like to ask if this machine is effective enough, should I choose the double cylinder type, how is the performance and durability when used with gas such as R134A or R410A, and if anyone has used it, please give me a more practical review.

Thanks.