# Klein Tools RT210 GFCI and AC Outlet Tester Outlet: The Klein Tools RT210 is a hand-powered plug-in tester for standard and GFCI receptacles. Its indicator lights and printed chart are intended to help identify common wiring conditions, while its GFCI test checks operation of the ground-fault protective device. - [Original product page](https://best-deals.pro/product/klein-tools-rt210-gfci-ac-outlet-tester) - [View offer](https://best-deals.pro/visit/klein-tools-rt210-gfci-ac-outlet-tester) - Market: US - Language: en-US - Currency: USD - Brand: KLEIN TOOLS - Model: RT210 - Price: 10.98 USD - Previous price: 13.98 USD - Discount: 21% - Price checked: 2026-11-12T11:50:06.868Z - Rating: 4.8 / 5 - Reviews: 8986 Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store. ## At a glance - Indicates common wiring conditions from its light pattern, with a chart on the tester to help interpret the results. - Designed to test standard and GFCI receptacles and check GFCI protective-device operation. - Manufacturer says the unit is built to withstand a 6.6-foot \(2m\) drop. ## Pros - Printed light-pattern chart provides an at-a-glance reference when checking receptacles. - Hand-powered design needs no separate battery for the described outlet tests. - Compact listed dimensions and low listed weight suit carrying between outlets. ## Cons - Indicates common wiring problems rather than providing the broader measurement functions of a general-purpose electrical meter. - The manufacturer lists a limited operating range of 110/125V AC in a 3-wire outlet. ## Specifications ### Identity - Brand: KLEIN TOOLS - Model: RT210 ### Electrical testing - Power configuration: Hand Powered - Nominal voltage and frequency: 110/125V AC at 50/60Hz in 3-wire outlet - Compatible receptacles: Standard and GFCI Receptacles - Specification listed: Cat Ii 300v ### Operating conditions - Operating temperature: 32-Degree to 140-Degree Fahrenheit \(0-Degree to 40-Degree Celsius\) ### Dimensions and weight - Dimensions: 5.3 x 3.8 x 1.5 inches - Weight: 1.9 ounces ## Before you buy - The listed fault indications include open ground, reverse polarity, open hot, open neutral and hot/ground reversed. The tester's indication is a screening aid and does not establish that an outlet or installation is safe. Follow appropriate electrical procedures. ## In the box - GFCI outlet tester (Included) ## A good fit for - DIYers checking common wiring conditions at North American standard and GFCI receptacles. - Users wanting a compact tester with a printed guide for interpreting indicator lights. ## Less suited to - Buyers who need detailed voltage, current or resistance measurements. - Users testing receptacles outside the stated 110/125V AC, 50/60Hz, 3-wire application. ## Customer feedback Customer feedback describes the tester as easy to use, compact and readable, with reports of useful wiring indications and quick outlet checks. That simplicity aligns with its indicator-light and printed-chart design, which is for common receptacle checks rather than broad electrical measurements. Feedback also raises reliability concerns, including reports of failures after a few months, so longevity may matter to frequent users. - Positive themes: Customers report convenient operation and clear light-pattern interpretation. - Positive themes: Customers describe it as compact and useful for DIY outlet checks. - Negative themes: Some customers report that the tester stopped working after a few months. ## Frequently asked questions ### What receptacles is the RT210 intended for? The listing says it works with standard and GFCI receptacles in 3-wire outlets, with nominal voltage stated as 110/125V AC at 50/60Hz. ### What wiring conditions can it indicate? The listing names open ground, reverse polarity, open hot, open neutral and hot/ground reversed. A chart on the tester helps interpret the light pattern. ### Does it test a GFCI outlet? It is designed to check GFCI protective-device operation as well as indicate common wiring problems. 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