High voltage rectifiers; high voltage dielectric strength testers; cable locator; cable surge voltage generators; high voltage testers; power transformer testers; measuring bridges, transit time measures, fault locators and cable selectors for use in the telephone and power electric industries; equipment for testing insulating materials and bodies electrically, namely, Time Domain Reflectometers, partial discharge measurement instruments for electric power equipment like cables, motors, transformers, switchgears, partial discharge fault locators for electric power equipment like cables, motors, transformers, switch gears, Very Low Frequency (VLF) testers; insulation diagnostics, namely, dielectric strength and aging testers, dissipation factor and loss factor measurement instruments for the assessment of aging of insulating materials; others cable testing equipment, namely, battery-operated and / or power controlled high voltage testers, programmable high-voltage generators, cable and line identifiers, transient recorders, burn down transformers; electrical and electronic testing equipment, namely, insulation testers and oil testers; cable test vans for servicing cable emergencies with the aforementioned goods