GDZG-300 series of DC high voltage tester e ho'āʻo nei i ka DC kiʻekiʻe no ka zinc oxide lighting arrester, magnetic blowing arrester, power cables, generators, transformers, switches, a me nā mea pono'ē aʻe, i kūpono no ka lālā mana uila, mana mana o nā hale hana, nā ʻāpana noiʻi ʻepekema, alahao, ʻoihana kemika, nā mea kanu mana.