Compact light instrument making it possible to conduct the measurements of insulation resistance to 5 Tom, with a test stress of from 250 [v] to 5 sq. measurement of the insulation resistance of high-voltage equipment (transformers, electric motors, networks) automatic calculation and the image of the index of polarization and dielectric absorption coefficient a gradual increase in the test stress the measurement of the currents of leakage and temperature the compensation for temperature actions record and storage of data, USB the interface