PIC Gauges 101D-158E Bottom Mount Dry Pressure Gauge w/ Black Steel Case, Brass Internals, Chrome Bezel, Plastic Lens, 1.5" Dial, 0/100 psi Range, 1/8" Male NPT

I gave this three stars in the accuracy department "by default" because I don't have a means of independently verifying its accuracy. Accuracy did not apply to my situation, only repeatability. That is not to say it is not accurate, just that I don't objectively know that.Situation: vacuum pump on a home winebrewing setup. The pump came with a check valve pre-set to a particular vacuum and a rubber bulb that collapses when the vacuum passes around 15"Hg, so you can pull most of the air (and therefore oxygen) out of the win'e headspace while the wine is clearing. But while a clever idea, a no-go in practice: the bulb, once collapsed, often gets stuck in the collapsed state and you have no vacuum but think you do. And I also use the pump to draw a "high" vacuum, i.e. the most the pump will provide, when degassing the wine and a collapsed bulb gives me no indication of what or when that is.Originally I was going to buy a vacuum gauge with a hose barb, but I wasn't too keen on the idea as that just gives yet another place where air can leak in. On a hunch, I bought the PIC with a 1/8" NPT fitting, and screwed it into the hole of my carboy stopper. Air of course leaked right past the threads, after all that is not what the gauge is designed for. I then thoroughly cleaned the hole in the stopper and the threads of the gauge and let them dry, and then I over-superglued the NPT fitting into the stopper hole (flipped upside-down while the glue dried so the glue couldn't seep into the gauge's internal works).Works like an absolute champ. Not only do I see the vacuum drawn instead of just a general and unreliable guess, but I have experimentally found what the maximum vacuum (according to the gauge) the pump is capable of and what vacuum the bulb/check valve setup was pulling during aging, so I can just fire up the pump until the gauge is reading >20" Hg (head space reduction for aging) or >25" Hg (maximum vacuum for degassing, and a newly-fermented wine starts bubbling like mad at that reading) and check instantly to see if that vacuum is being maintained later on.Like I said, I cannot confirm the PIC's accuracy (all I care about is I maintain a vacuum level that works, irrespective of whether that reading does or does not reflect the "real" value) but what I can objectively attest to is that it is small, light, inexpensive, well-made, reliable, repeatable, and versatile.

First of all, the gauge arrived with the needle over 1/8" from the zero post (see picture). I can live with this since I bought this to do relative measurements on a few vacuums to see which was most powerful. But then, looking closer, I noticed the scale itself is off. Between the numbers -5 and -10 there are 4 major tic marks indicating the numbers 6, 7, 8, and 9. This is true for the tic marks between -10 and -15, etc. BUT, between the numbers 0 and -5 there are only 3 major tic marks! You can see this on my photo, but it's more clearly seen on the product photo in the Amazon listing... Obviously the manufacturer never thought someone would actually attempt to use this. Oh well, what can you expect for $5?

It was awhile before i actually went to use this product , when I took it out of the package today i realized the needle was not on zero as it should have been . this unit has no provisions for calibration or adjustment . I might as well have thrown 5 dollars into the trash can . Really not worth the effort to return though.

I can't really comment on if this gauge actually works or not because I accidentally squished it. It has decent reviews already so I'm just going to assume it works. Well WOULD have worked. It was cheap so no big deal that it's now smashed.

This is a good pressure gauge for checking the PSI on my spare air tank. Its built solid and is nice and small to fit the space I have.

Tried to find way to contact seller but no luck. Soon as I turned bottle on broke gauge, even though mechanical regulator wont allow over 100psi it shows gauge pegged. If seller could contact me that would be appreciated

Shows 10PSI without any pressure - broken within a few months of use.

Gauge worked perfect for my application