GDDO-20C AC / DC Igikoresho cya Electric Meter Calibration Device ikoreshwa mugutahura ikosa ryibanze ryibikoresho bitandukanye byamashanyarazi yumuriro wamashanyarazi, harimo voltmeter, ammeter, wattmeter, ohmmeter, icyiciro kimwe & metero eshatu za AC ingufu za metero (kubishaka) hamwe nikosa ryibanze rya DC volt-metero na ammeter.