Volume resistance/surface resistance tester Ultra wide resistance range: covering a measurement range of 106 Ω to 1018 Ω, accurately adapting to the resistivity detection needs of various insulation materialsMulti level high voltage output: supports10V/50V/100V/250V/500V/1000V optional voltage meets the withstand voltage testing standards of different materialsDual mode high precision: Integrated volume resistance and surface resistance dual testing modes, high-precision