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DT261 Insulation Tester Unit is the adaptor for the 266 series clamp meters. Using a DC-DC Converter, it converts 6V DC to 500C DC.
It is a variable range insulation tester (100KΩ-2000MΩ), powered by four AA size batteries, and can provide 30 working hours which depend on the type of battery and how often it is used.
It has the advantages of reasonable design and ease of use.