The application of this instrument for the effective testing of isolation is expedient. Instrument 3454 -10 unites 4 ranges: 50 beside, 125 before, 250 beside, and 500 [v], DC. The instrument of 3454 -11/-51 unites 3 ranges: 250 beside, 500 beside, and 1000 [v], DC. Security system for measuring the high voltage large digital screen with the continuity of 200 m[A] will recognize different forms of the resistances