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

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

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: 756166332

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Details

Brand
KLEIN TOOLS
Power source
Corded
Style
Receptacle
Colour
Multi
Item weight
0.26 Pounds

📟Large backlit LCD readout

⏱️GFCI trip time display

🛠️Patent-pending open neutral & ground detection

Description

⚡ Test Smarter, Work Safer — The Klein RT250 Means Business

AUTO HOLD CONVENIENCE - Capture readings effortlessly in tight or awkward spots with the handy auto-hold feature—work smarter, not harder.
CRYSTAL CLEAR LCD DISPLAY - Instantly read voltage and wiring status with a bright, backlit screen—no guesswork, just precision.
NEXT LEVEL FAULT DETECTION - Detect open neutral and ground faults with patent-pending tech—because safety is non-negotiable.
PRO GRADE SAFETY CERTIFIED - CAT II 135V rating ensures reliable, professional-grade testing you can trust on every job.
SPEEDY GFCI TRIP TIME INSIGHT - Know exactly how fast your GFCI trips with real-time timing—cut troubleshooting time in half.

The Klein Tools RT250 is a professional-grade GFCI outlet tester designed for North American 3-wire 120V receptacles. Featuring a large backlit LCD for clear voltage and wiring fault readouts, it uniquely displays GFCI trip times and detects open neutral and ground faults with patent-pending technology. Lightweight and equipped with an auto-hold function, it offers convenience and precision, backed by a CAT II 135V safety rating for dependable, on-the-job electrical testing.

Specifications

Manufacturer	Klein Tools
Part Number	RT250
Product Dimensions	11.51 x 2.95 x 5.08 cm; 117.93 g
Batteries	2 AAAA batteries required. (included)
Item model number	RT250
Size	Receptacle Tester
Colour	Multi
Style	Receptacle Tester
Finish	Brushed
Material	Blend
Pattern	Solid
Shape	Rectangular
Power Source	Corded Electric
Item Package Quantity	1
Certification	CSA
Special Features	Large LCD Display; Patent Pending Detection of Open Neutral Open Ground Wiring Fault; Shows Amount of Time it Takes to Trip GFCI
Included Components	2 x 1.5V AAA Alkaline Batteries and Manual
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Item Weight	118 g

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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