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As an American manufacturer of hand tools for more than 160 years, Klein Tools makes premium-quality, professional-grade tools that deliver performance, durability and precision. Our team continues to put six generations of expertise into each tool by using the highest quality materials and superior workmanship.
Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day Since 1857.
Klein Tools RT110 Receptacle Tester detects the most common wiring problems in standard receptacles. Conditions indicated: wiring correct, open ground, reverse electrical outlet, open hot, open neutral, hot/ground reversed. Conditions not indicated: quality of ground, multiple hot wires, combinations of defects, reversal of grounded and grounding conductors.

110/125 VAC outlet tester detects wiring problems in receptacle

Tester with lighting sequence, indicates wiring correct condition

Also indicates open ground, reverse polarity and other conditions
![]() Klein Tools ET910 USB Power Meter and Tester, USB-A Digital Meter for Voltage... | ![]() Klein Tools RT210 Outlet Tester, Receptacle Tester for GFCI / Standard North ... | ![]() Klein Tools ET45VP Electrical Test Kit with GFCI Outlet Tester and AC/DC Volt... | ![]() Klein Tools RT310 Outlet Tester, AFCI and GFCI Receptacle Tester for North Am... | ![]() Klein Tools ET250 Voltage Meter, AC/DC Tester, Digital Multimeter, Low Voltag... | ![]() Klein Tools ET310 AC Circuit Breaker Finder, Electric and Voltage Tester with... | |
|---|---|---|---|---|---|---|
| Customer Reviews | — | — | — | — | — | — |
| Price | — | — | — | — | — | — |
| Mfg. No. | ET910 | RT210 | ET45VP | RT310 | ET250 | ET310 |
| Description | Klein Tools ET910 USB Power Meter and Tester, USB-A Digital Meter for Voltage... | Klein Tools RT210 Outlet Tester, Receptacle Tester for GFCI / Standard North ... | Klein Tools ET45VP Electrical Test Kit with GFCI Outlet Tester and AC/DC Volt... | Klein Tools RT310 Outlet Tester, AFCI and GFCI Receptacle Tester for North Am... | Klein Tools ET250 Voltage Meter, AC/DC Tester, Digital Multimeter, Low Voltag... | Klein Tools ET310 AC Circuit Breaker Finder, Electric and Voltage Tester with... |


As an American manufacturer of hand tools for more than 160 years, Klein Tools makes premium-quality, professional-grade tools that deliver performance, durability and precision. Our team continues to put six generations of expertise into each tool by using the highest quality materials and superior workmanship.
Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day Since 1857.

Klein Tools RT110 Receptacle Tester detects the most common wiring problems in standard receptacles. Conditions indicated: wiring correct, open ground, reverse electrical outlet, open hot, open neutral, hot/ground reversed. Conditions not indicated: quality of ground, multiple hot wires, combinations of defects, reversal of grounded and grounding conductors.

110/125 VAC outlet tester detects wiring problems in receptacle

Tester with lighting sequence, indicates wiring correct condition

Also indicates open ground, reverse polarity and other conditions
![]() Klein Tools ET910 USB Power Meter and Tester, USB-A Digital Meter for Voltage... | ![]() Klein Tools RT210 Outlet Tester, Receptacle Tester for GFCI / Standard North ... | ![]() Klein Tools ET45VP Electrical Test Kit with GFCI Outlet Tester and AC/DC Volt... | ![]() Klein Tools RT310 Outlet Tester, AFCI and GFCI Receptacle Tester for North Am... | ![]() Klein Tools ET250 Voltage Meter, AC/DC Tester, Digital Multimeter, Low Voltag... | ![]() Klein Tools ET310 AC Circuit Breaker Finder, Electric and Voltage Tester with... | |
|---|---|---|---|---|---|---|
| Customer Reviews | — | — | — | — | — | — |
| Price | — | — | — | — | — | — |
| Mfg. No. | ET910 | RT210 | ET45VP | RT310 | ET250 | ET310 |
| Description | Klein Tools ET910 USB Power Meter and Tester, USB-A Digital Meter for Voltage... | Klein Tools RT210 Outlet Tester, Receptacle Tester for GFCI / Standard North ... | Klein Tools ET45VP Electrical Test Kit with GFCI Outlet Tester and AC/DC Volt... | Klein Tools RT310 Outlet Tester, AFCI and GFCI Receptacle Tester for North Am... | Klein Tools ET250 Voltage Meter, AC/DC Tester, Digital Multimeter, Low Voltag... | Klein Tools ET310 AC Circuit Breaker Finder, Electric and Voltage Tester with... |