Aia ka JEF-300 series electromagnetic flowmeter me kahi mea ʻike a me kahi mea hoʻololi.Hoʻokumu ʻia ia ma ke kānāwai o Faraday o ka electromagnetic induction, i hoʻohana ʻia e ana i ka kahe kahe o ka wai conductive me ka conductivity ʻoi aku ma mua o 5μs/cm.He mika inductive no ke ana i ka leo kahe o ka mea conductive.