I have installed these sensors before and after all my house filter system and water softener to monitor my water pressure resistance. When installing new filters and a new water softener, they showed a pressure drop of about 1psi in the system. Inch what I expect is pretty close. As the filter ages, the difference increases. Thus, they appear to be accurate in relation to each other. I can't say I've scientifically tested them for the claimed accuracy. There is actually nothing special to say about pressure gauges. They don't flow and they seem to be accurate.
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