GDDO-20C AC/DC Electric Meter Calibration Device o loʻo faʻaaogaina e iloa ai mea sese masani o meafaifaʻaili eletise eletise eseese i faiga eletise, e aofia ai le voltmeter, ammeter, wattmeter, ohmmeter, tasi vaega & tolu vaega AC mita malosi (filifiliga) ma sese faavae o DC volt-mita ma le ammeter.