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Fluke Insulation Tester/Rotation Indicators are designed to make it easy for electricians to find hidden, hard-to-access electrical problems and assess wire insulation integrity. The rotation indicator clearly indicates whether an individual wire is energized with 60 Hz power (black), or whether the wire is grounded (green). The unique “X” style provides greater visibility, and the stainless steel blade makes for a quick insertion into the wire. The compact, light weight tester fits easily into tight places without risk of damaging insulation. Choose from a wide range of models that can perform a variety of tests at different voltage