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Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red

Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red

Q: Is it ok to use this tester for the 20a power outlet (not gfci)?

A Very good question, since the device name starts with GFCI. Answer is YES, because despite the name, the device is mainly a regular outlet tester, checking cross wiring, missing wiring, and reporting voltages, all worthwhile tests for non-GFCI outlet. Also works with 15amp & 30amp with adapter. Thanks for the question.

Q: Most of the outlets in the basement where i'm living say >6.00 when i test them. are they wired wrong? is it safe to use the outlets?

It is not safe to use those outlets. If an outlet is good, the green light on the tester should illuminate, and the display should register a voltage close to 120 volts.

Q: Is this accurate enough to measure with some confidence which is the most upstream receptacle in a circuit for choosing gfci location?

Resolution accuracy inadequate for that task. Displayed digits determines resolution. In this case, meter accuracy will not be and can not be better than +/- 1 volt because digital resolution is always +/- 1 in the least significant digit. Example: If measuring a true, standardised 120 volts, meter might display 119V (-1), 120V or 121V (+1) if calibrated/adjusted correctly. You've got the right idea, but this meter displays only 2-1/2 digits (120V). You will need a meter with 3-1/2 (120.0V) digits displayed. Worst case resolution at 120 volts will then be ~0.1V (100 mV). You need to see those millivolts differences. Get one with stated accuracy and preferably calibrated. Cheers!

Q: What will happen if you press the gfci test on a non gfci? will it do nothing. or will it trip the breaker in the panel, and i have to flip the switch

The amber lights on the tester will blink, nothing will trip.

Product ID: 557085750

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Details

Brand
KLEIN TOOLS
Power Source
Corded
Style
Receptacle
Colour
Multi
Item Weight
118 g

📊Clear LCD readout

⏱️Trip time display

🛡️Patent-pending fault detection

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Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles

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Description

⚡ Test Smarter, Work Safer, Lead Confidently

AUTO HOLD CONVENIENCE - Lock readings on hard-to-reach outlets—no more guessing or repeated tests.
BRIGHT LED INDICATORS - Green and red LEDs provide immediate visual confirmation of wiring conditions—speed up your workflow.
CRYSTAL CLEAR LCD DISPLAY - Backlit screen ensures effortless voltage readings and wiring status at a glance.
NEXT LEVEL FAULT DETECTION - Patent-pending tech spots open neutral and ground faults others miss—stay ahead of electrical hazards.
PRECISION TRIP TIME MEASUREMENT - Instantly see how fast your GFCI trips for accurate troubleshooting and safety assurance.

The Klein Tools RT250 GFCI Outlet Tester combines a large backlit LCD with patent-pending open neutral and ground fault detection to deliver precise, reliable testing of 120V 3-wire receptacles. Featuring trip time display, auto-hold functionality, and bright LED indicators, it’s engineered for professionals demanding accuracy and safety in every electrical inspection.

Specifications

Brand	KLEIN TOOLS
Power Source	Corded Electric
Style	Receptacle Tester
Colour	Multi
Item Weight	118 g
Item dimensions L x W x H	11.5 x 2.9 x 5.1 Centimeters
Min. Operating Voltage	120 Volts
Specification Met	CSA
Upper Temperature Rating	60 Degrees Celsius
Measurement Type	Voltage Tester
Maximum Operating Voltage	120 Volts
UPC	092644693212
Manufacturer	Klein Tools
Global Trade Identification Number	00092644693212
Country of Origin	USA
Model number	RT250
Number of Memory Sticks	1
Special Feature	Large LCD Display; Patent Pending Detection of Open Neutral Open Ground Wiring Fault; Shows Amount of Time it Takes to Trip GFCI
Product Dimensions	11.51 x 2.95 x 5.08 cm; 117.93 g
Batteries	2 AAAA batteries required. (included)
Item model number	RT250
Item Height	2 Inches
Item Width	1.16 Inches
Included Components	2 x 1.5V AAA Alkaline Batteries and Manual
Are batteries included?	Yes

Have a Question? See What Others Asked

Is it ok to use this tester for the 20a power outlet (not gfci)?

Most of the outlets in the basement where i'm living say >6.00 when i test them. are they wired wrong? is it safe to use the outlets?

Is this accurate enough to measure with some confidence which is the most upstream receptacle in a circuit for choosing gfci location?

What will happen if you press the gfci test on a non gfci? will it do nothing. or will it trip the breaker in the panel, and i have to flip the switch

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