The UT-593 is a multifunction measuring device designed for use by electricians in electrical installations. The device also serves as a comprehensive safety tester for electrical systems. With the UT-593, you can measure insulation resistance, earth fault loop resistance with and without a tripping RCD, line resistance, continuity of protective and equipotential conductors, tripping current and tripping time of the RCD, AC voltage values, and phase sequence indication. To accurately measure the insulation resistance value, applying high voltage is necessary. When measuring, you must exercise extreme caution and strictly adhere to the recommendations in the device's manual.