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The Klein Tools RT210 Outlet Tester is a professional-grade device designed to quickly identify common wiring problems in standard and GFCI receptacles. Featuring durable construction that withstands 6.6-foot drops and a broad operating temperature range (32°F to 140°F), it ensures reliable, accurate testing on 110/125V AC circuits. Trusted by electricians and DIY pros alike, this compact tester delivers peace of mind by verifying proper wiring and GFCI functionality with easy-to-read LED indicators.












| ASIN | B01AKX8L0M |
| Best Sellers Rank | #1,289 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Circuit Testers |
| Brand | KLEIN TOOLS |
| Brand Name | KLEIN TOOLS |
| Color | Black/Orange |
| Compatible Devices | Standard and GFCI Receptacles |
| Customer Reviews | 4.8 out of 5 stars 8,973 Reviews |
| Global Trade Identification Number | 00092644690273 |
| Included Components | GFCI Outlet Tester |
| Item Dimensions | 5.3 x 3.8 x 1.5 inches |
| Item Type Name | Klein Tools RT210 GFCI Receptacle Tester |
| Item Weight | 1.9 ounces |
| Item dimensions L x W x H | 5.3 x 3.8 x 1.5 inches |
| Manufacturer | Klein Tools |
| Minimum Operating Voltage | 110 |
| Model | RT210 |
| Number of Items | 1 |
| Part Number | RT210 |
| Power Source | Hand Powered |
| Specification Met | Cat Ii 300v |
| Style | GFCI Testing |
| Style Name | GFCI Testing |
| UPC | 092644690273 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 140 °F |
| Warranty Description | See Manufacturer Website |
C**N
Simple and reliable
This Klein outlet tester is a very handy tool to have around the house. It’s extremely simple to use—just plug it into an outlet and the indicator lights quickly show whether the wiring is correct or if there’s a problem like an open ground or reversed wiring. The built-in GFCI test button is also very useful. It allows you to quickly verify that GFCI outlets are functioning properly and trip when they should. I used it to check several outlets around the house and it worked exactly as expected. The build quality feels solid, which is typical for Klein tools, and the printed legend on the front makes it easy to interpret the light patterns. Overall this is an inexpensive but very useful tool for homeowners, DIYers, or anyone who wants to quickly verify outlet wiring and GFCI protection.
R**O
Satisfied Customer
It does what it needs to do. I moved into a new house with older wiring and had to check a lot of outlets. This tester has been a lifesaver for quickly finding basic wiring issues without needing electrical experience. I found a few outlets that needed attention, and this made it much easier to check everything around the house. It's especially useful when moving into an older home where you don't know what previous owners may have changed. This won't replace a multimeter or a professional inspection, but for a homeowner doing basic checks, it's a simple and affordable tool to have around. Plug it in, read the lights, and you can quickly see if something looks wrong before plugging in expensive electronics. Comes with a guide showing you all the possible codes.
L**A
Works well—good price!
New RVers—used this to check each outlet. Very easy to operate!
H**R
Very handy to have around
Just wired my shed & little guy let me know I did a great job cause all the outlets are wired & working correctly!
A**N
Must have
Quickly identifies wiring issues and gives clear indicators. Compact and sturdy. Lost one star because the labeling could be a bit clearer in low light, but overall a dependable tool for electricians and DIYers
L**I
Works great!
Very easy to use and read. I felt like a pro…now I just have to get someone to repair the issues I found.
M**M
BUEN PRECIO
ME GUSTO
R**E
Works great
This is about as much a tester as you would ever need for GFCI sockets. I would have used it today, but for some reason, due to its compact size I have misplaced it-which is not a fault of the outlet tester. The bright orange color should facilitate locating it in a miscellaneous drawer-you would think.
伊**伸
アースが効いているか明確に
英語表記
Y**E
Indispensable para músicos
Funciona muy bien, muy práctico para revisar si está bien conectado un enchufe de electricidad, con si respectiva fase, neutro y tierra. Altamente recomendable para músicos, ingenieros de audio que trabajen en distintos recintos.
A**Y
Original quality.
True Klein product. Works as it should. Love it for assessing electrical outlets.
Ó**A
Excelente
Muy útil
L**N
Works Great!
Easy to use, works well, and is accurate. Handy tool to have and inexpensive enough to keep in a tool box for when / if it is required. Feels sturdy and well built, I have not had any issues with the quality of the tool.
Trustpilot
1 month ago
1 month ago