My employer bought this meter to save money. I have a very nice Ritchie vacuum gauge for my personal work, but it's almost three times the price of this gauge and my employer wouldn't pay as much. After a year of use, I noticed a decrease in accuracy. I cleaned it regularly using the manufacturer's recommended procedure and kept fresh batteries in it. Unfortunately, the accuracy continues to decrease. After what I would describe as light to moderate use, it now reads nearly 60 microns higher than my Ritchie, which I know to be accurate. And there is no way to adjust the supco gauge. This manometer is suitable for beginners or for advanced do-it-yourselfers. I do not recommend this for field devices.
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