Differential pressure transmitters offer accurate low-differential pressure measurement of liquids, air, and many gases for air filter monitoring, building pressurization, clean rooms, and liquid level monitoring applications. Available models sense up to 400 inches water column to measure positive, negative, and differential pressures, easily scaled to a different pressure range and units of measure.
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Would you buy this item again? Yes
They are very simple devices which is an advantage. They do the job and are great value for the price.