For the money, it's not bad, but perhaps if you JUST WANT IT TO WORK, then spend a little more for a better one. Keep in mind, more expensive doesn't always mean better. Mine came statically at 15hg, but that may be expected. I build a vacuum pump by turning an old air compressor backwards, and the gauge I had on hand was a dry gauge. When it was new, it worked fairly well, but now that it's aged a bit, I have to tap the gauge to get a "current" reading which is really annoying. When the pump is turned off, sometimes it's stuck at some level so I never know what my vacuum pressure is, so I had to replace it with something better, oil filled. So, this gauge is WAY better than what it replaced. So, as described above, I no longer have to constantly tap the gauge to get a reading, which I'm happy with. However, when I turned on my pump with this new gauge for the first time, it started moving slow, which is expected, since the tank is a 30 gallon tank. Once it started dropping pressure, it started dropping fast. However, it seems this gauge is a little "sticky". It "pulse drops" by about 3-5hg at a time, but it isn't stuck. I also, I question the accuracy of this gauge. When I originally built my pump, I was able to pull about 28-30hg (based on the dry gauge I installed). Now, the same gauge only goes as low as 25hg. Now, only changing the gauge from a tired dry gauge to this new wet gauge, I'm able to easily reach 30hg, and even peg the needle in the max position, which I could imagine 35hg (which isn't possible). So, I might trust the accuracy of my old dry gauge, since it's easier to reach 25hg than to reach 30hg+. However, I'm just happy that I don't have to babysit the gauge while I'm using it.
