Review on BACOENG HVAC/A/C Refrigeration Kit - Vacuum Pump & Manifold Gauge Set - Diagnostic R12 R22 R134a R410A - with Case by Jake Jones

I give it 5 stars because I ran it for hours and it worked for my mini split. Not sure how it compares to other pumps. Using a standard gauge tube with 1/4" fittings and a micrometer fitting on the pump, I was able to get the pressure down to 130 microns. I'm not sure if I had a thicker vacuum tube, it would be lower. The carrying case provided is roomy , looks great and makes a great portable mini split bag Enough space and intended space to store other tools and parts like vacuum gauge set and hoses, tube valve stem removal, adapters and more stuff I definitely had to change the oil often to keep a strong It's not the pump's fault as they pull all the air and nitrogen and moisture or whatever out of the line installed during vacuuming, which in my case appeared as tiny bubbles (1/64 inch diameter or smaller? ) at the top of the oil in the oil level window after a while. And at this moment the vacuum is weaker. There are not even that many bubbles, but when If you see them, this is a warning that some gas has become loose or mixed with the oil, reducing pump efficiency. An oil change brings immediate improvement. It's just a known thing. The pump will definitely get warm (but not hot) after prolonged use. but it doesn't seem to hurt.