Ana amfani da GDDO-20C AC / DC Electric Meter Calibration Na'urar don gano kuskuren asali na kayan aikin mitar wutar lantarki daban-daban a cikin tsarin wutar lantarki, gami da voltmeter, ammeter, wattmeter, ohmmeter, lokaci ɗaya & mita AC makamashi uku (na zaɓi) da kuskuren asali na DC volt mita da ammeter.