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I-Extech RF20 Portable Salinity Refractometer iyidivayisi yokusika eguqula indlela amazinga kasawoti. zilinganiswa ngezixazululo ezinamanzi. Yenzelwe ngokunemba nangokulula engqondweni, le-refractometer ephethwe ngesandla ithuluzi lokuhamba kochwepheshe nabathandi kuzo zonke izimboni ezahlukahlukene.