| http://www.w3.org/ns/prov#value | - of acidic water without containing such constituents as calcium, magnesium, and the like, adherence of the constituents such as calcium, magnesium, and the like to the flow meter 80can be prevented, ensuring accurate measurement of the flow rate;Since means for measuring conductivity of clean water is designed such that measurement is made by applying a low voltage between the first electrode plat
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