Major parameter:
1) Test insulation impedance and continuity of two core/three core AC/DC power wire and earphone wire
2) wire sensitivity: 0-1000pF adjustable continuously
3) insulation impedance: 0-1000MΩ adjustable continuously
4) test voltage: DC100、250、500V three shelves selectable
5) qualified acousto-optic denote
6) unqualified has corresponding index denotation value