Summary The Arrester is suitable for testing the internal defects of 10KV and below 10KV MOA (metal Oxide Arrester).Before the annual season of thunderstormsit 's necessary to test metal Oxide using 1mA DC voltage and 0.75U1mA leakage current at Power plants/substations.The equipment was developped according to the requirement of site it 's integrated with DC HV supplymeasurement and control system. it has the characters of small size and light weight. Feature 1.Supply power: AC220V or Charging battery. 2.LCD display test datas. 3.Convenient to carry.