CPSCPS VG200 Digital Vacuum Gauge | NIST Calibration for Accuracy | Withstand 400 Psi Pressure, Easy-to-Read 5-Digit LCD | Perfect for Vacuum Testing in HVAC/R Systems

I received a used one which was covered in refrigerant oil and requested a replacement. I would have been ok with a used on but not at full price. A replacement was sent promptly and a precision micron gauge like this will make your mini split installs a lot easier and give you greater confidence that you have pulled a deep vacuum. Get a 9v battery when you place your order

Everything Ok

I am not an AC Tech by any means, however I have done my research and feel that this review will give someone some good info. When I first attached this device I could not pump down under 900 mic on any line set. I questioned the device at first, but then started looking for leaks, and as I read and read that if you cannot get below 500 mic then you have a leak somewhere. I started looking, first at the pump, found a small leak as I have a pump that has 3 connection ports that are capped with plastic caps. Then I found that I had not tightened a coupler enough and then found a bad flare (of course these items were all on different line sets). As soon as I took care of these small items all three line sets that I installed pumped down to below 250 mic. I also learned to read what the device was doing while the pump was running. It would bounce back and forth between numbers 830/840/850/840/830 etc and would go no lower. This told me that something was wrong. All the while I was watching the pressure gauge and it was holding at 30 psi. This device worked perfectly and I would recommend it to anyone who is installing any sort of HVAC system. I think my only gripe is that it turns off after 10 minutes so you have to turn it back on over and over.

Quality product, easy to use, beats the old thermistor vacuum gauge that was a standard in the trade for years!

buen producto lo recomiendo

Worked perfectly on a Mitsubishi mini-split install during line/system drawdown for leak detection.

I work as a Production Manager for a chemical manufacturing company. I have been around vacuum pumps and vacuum gauges for almost 20 years and tried many different types and brands. I have certain go-to brands that have proven to be reliable and accurate. Recently we decided to try to improve a certain step in our process and knowing the vacuum inside the equipment is critical. Typically I use another brand that is very accurate, but is a lot more expensive. Since I am looking to purchase a total of 8-10 of these, I started looking for a cheaper option.I just got this today and I put it in line with my other gauge just to see how similar they were to each other. The process I was doing, I wanted the vacuum around 65 torr. My go-to gauge consistently read between 64-65 the entire time I was testing, which was probably around 30 mins.During that time, this gauge immediately read 20 torr lower, and continued to drop until it settled on 2.2 torr while the other gauge read 64. The equipment I was using for this test is not capable of reaching that kind of vacuum.I regularly use other equipment that can achieve a vacuum as low as 0.2 torr.In summary, this is not a reliable and accurate vacuum gauge. I immediately boxed it back up and will be returning it.

Works perfectly vacuumed down my a/c system down to 200 microns.