Insulation resistance measurement (MIC-5001) measures voltage selectable in the 50. 500 V range with 50 V step, and in the 500 V to 5000 range with 100 V step, continuous indication of insulation resistance or leakage current, automatic discharge of capacitance of tested object after the insulation resistance measurement, acoustic signaling of five-second periods to facilitate obtaining time characteristics, measured test times of T1, T2 and T3 for measuring the absorption coefficient DAR and polarization index PI, indication of actual test voltage during the measurement, protection against measuring live objects.