Klein Tools RT250 GFCI Outlet Tester with LCD Display for 120V 3-Wire Receptacles

• Amazon now offers the Klein Tools RT250 GFCI Outlet Tester for $19.98 (list price $24.97).
• Prime members get free two-day shipping, and regular members get free shipping on orders over $35 within the contiguous U.S.
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Editor's Pick: After a renovation or a move, just plug it in to see if your outlet wiring is correct. The backlit screen displays clear digital readings, easy to read even in dim areas. When testing GFCI protection, it shows the trip time directly—no need to count seconds yourself.