Master #A401

I really like this product! The quality is good, it’s easy to use, and it works well for me. I’m happy with my purchase and would recommend it to others.

Missing valve core removal tool , delivered incomplete accessories

Quality is great

The first sample that I have received had an issue and was leaking from the small glass window, yet the Seller or Amazon just accepted the return with not much question asked and sent a replacement within 2 days. So kudos to them for this. The second sample worked fine and has been used to recharge a r410a residential "water pressure heat pump" apartment unit. The gauges easy to read, decent gloves are provided, the hoses looks fine and all the knobs rotate smoothly. I have not used the car adapters yet, but the labels on the knobs seems to be marked at the opposite direction, other than that they seems to be of good quality. The only grip I have about this set, is that the hoses do not screw all the way in as smoothly in to the service ports and manifold, as others that I have seen on youtube videos. In my case they screw in well the first 2 turns, then they become a bit hard and they are still not snug enough, therefore they made me leak a little more more refrigerant than expected. I needed to use a plier to grab and screw them tightly enough. I suggest to break the threads in, before using them the first time, by tightening them back and forth a few times. I did that and it improved quite a bit, yet on the high side ports it still needs a plier to tight them up. Anyway, once they are tightened up, the hoses do not leak at all and the manifold works as expected, The knobs are really smooth and allow you to use them precisely. Also there is a purge valve on the yellow/supply line, which allows to purge air before charging refrigerant. I used this set once to charge R410a refrigerant and another time to inject sealant and a chemical to remove eventual moisture from the system. So I would say for less than 60$ plus a bottle of refrigerant, it was a good investment since it allowed me to service my AC unit without having to rely on HVAC techs, that in NYC are very expensive ( it would have cost me about 650$) and normally service your system incorrectly so they can come back again soon and try to sell you a new unit when it is not necessary.

Not the highest quality but for home use it was just what I needed to install a replacement mini split. Already have refrigerant gauges for 134A from being in the business. These allowed me to evacuate and vacuum check for leaks then check operation once charged with refrigerant. No muss no fuss worked perfect. Now going to check our main a/c system before summer gets here.