#21 in Top 25 Tools this week
Klein Tools RT250 GFCI Outlet Tester
Plug it into an outlet to see if it's wired right. Simple safety check for any home.
Why it's here: Best seller at Amazon (#9 in Measuring & Layout Tools) (checked October 15, 2026). Prices change often, so check the store for today's price.
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Rank history
Week of October 15, 2026#21 Tools