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</html><description>The term &#x2018;relative pressure method&#x2019; (also known as absolute pressure method or differential pressure method) is derived from pressure measurement relative to ambient pressure. If the pressure is measured absolutely, i.e., relative to absolute vacuum, the term &#x2018;absolute pressure method&#x2019; is also used. Various manufacturers use the terms &#x2018;pressure change method&#x2019; or &#x2018;differential pressure method,&#x2019; [&hellip;]</description></oembed>
