I finally managed to use it and it reads a vacuum under 500 microns pretty well but it won't hold vacuum. It started to rise as soon as I closed the valve. Tried my friend's vacuum gauge with the same hoses and pump assembly and it held a vacuum. I tried again with my Supco gauge and it didn't hold a vacuum. I am using it for the first time and it is NOT good. Update I should have written a review for this product a while ago. The company replaced my vacuum gauge right away with no problems and this has worked fine for a couple of years and is still working. Sometimes you get a bad apple, but I was happy with the replacement. Thank you!
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