| http://www.w3.org/ns/prov#value | - Product DescriptionSoap film flowmeter, by replacing the different specifications of the soap membrane to achieve 50mL/min-30L/min flow measurement, suitable for metrological verification, environmental monitoring, labor and health, research institutes and other departments, a variety of flow meter calibration detection work.The implementation of standardsJJG 586-2006 "soap film flowmeter test pro
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