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Fluke 1507 is a handheld insulation resistance tester used to measure the integrity of electrical insulation in motors, cables, transformers, and other electrical equipment. It applies a test voltage to the insulation and measures resistance in megohms to help identify breakdowns or deterioration before failure occurs. This tester features selectable test voltages typically ranging from 50 to 1000 volts, allowing it to match the rating of the equipment being tested. It also includes automatic calculations such as polarization index to assist with in‑depth analysis of insulation condition. The Fluke 1507 is commonly used by electricians and maintenance personnel to ensure safety and reliability in industrial and commercial electrical systems.