Insulation resistance measurement: Selectable measurement voltage in the 100 2500 V 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 signalling of five-second periods to facilitate obtaining time characteristics, measured test times T1, T2 i T3 to measure one or two absorption coefficients in 15, 60 and 600 s, indication of actual test voltage during the measurement, protection against measuring live objects, two and three-lead measurement method, Continuity measurement of protective and equipotential conductors according to EN 61557-4 with the >200 mA current. Leakage current measurement. Measurement of alternating and direct voltages in the 0...750 V range. Built-in rechargeable battery pack. The instruments meet the requirements of the EN 61557 standard. The ability to charge from car lighter (12 V) socket (additional accessories).