ZC93 Megger/ Insulation Tester This series of instruments suitable for measuring a variety of electrical equipment and the various elements, the insulation resistance of the material. Measuring voltage characteristics have excellent alarm setting function, particularly suitable for use in the production pipeline. Model nominal voltage measurement range V Tolerance MΩ accuracy ZC93-1 100 ±5% 0-100 Level 10 250 0-250 ZC93-2 250 0-250 500 0-500 ZC93-3 500 0-500 1000 0-1000