Klein Tools RT210 Outlet Tester for $11 + free shipping

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Amazon has the Klein Tools RT210 outlet tester at $11, down from $14. It checks both standard and GFCI outlets for common wiring problems, and it's rated to survive a 6.6-foot drop. Shipping is free for Prime members. Buy Now at Amazon Features detects the most common wiring problems in standard and GFCI receptacles