GDZG-300 mndandanda wa DC mkulu voteji Tester ndi kuyezetsa DC mkulu voteji kwa zinki okusayidi kuyatsa arrester, maginito kuwomba arrester, zingwe mphamvu jenereta, thiransifoma, masiwichi, ndi zipangizo zina, amene ali oyenera nthambi yamagetsi yamagetsi, dipatimenti yamagetsi ya mafakitale, mayunitsi kafukufuku sayansi, njanji, makampani mankhwala, zomera mphamvu.