Klein Tools RT210 GFCI Outlet Tester

This deal has ended. The price below is what it was when we checked it — the retailer's page will show something else now. See what is current →

Amazon has Klein Tools RT210 GFCI/Standard Outlet Tester on sale for $10.98, down from $13.98. Shipping is free with Prime or on orders over $35.

By Plumzoo · Posted October 10, 2026.

• Plugs into any standard or GFCI 3-wire 110/125V outlet to check for wiring faults
• Lights indicate open ground, reverse polarity, open hot/neutral and hot/ground reversed
• Rated to survive a 6.6-foot drop and works from 32°F to 140°F
• Pocket-sized at 1.9 ounces, no batteries required

We earn a commission through retailer affiliate links. Price and stock are set by the retailer, not by us.
How this deal was checked →