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\n<\/p><\/div>"}, consider supporting our work with a contribution to wikiHow. Meters provide the most accurate measurement of voltage, amperage and resistance. Two common variables that contribute to resistance are length as mentioned above and size or diameter of the conductors in the cord. Identify any defective electrical work. How do I get an EICR Test? Multimeters are the most common piece of electrical test equipment. It's also known as an insulation tester. This section provides a summary of those precautions. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. This 'Initial' inspection and testing 2392 course has been designed and developed by the electrical industry with City & Guilds. A megger is an ohmmeter that measures resistance in the megohm scale. Electrical safety. 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