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.

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.

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!

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.

Desertcart Logo

描述

⚡ Test smarter, work safer, and stay ahead with Klein’s pro-grade precision!

VISUAL SAFETY SIGNALS - Bright green/red LEDs give you instant wiring status at a glance—no guesswork needed.
HANDS FREE CONVENIENCE - Auto-Hold locks readings for those hard-to-reach outlets—work smarter, not harder.
INSTANT VOLTAGE CLARITY - Large, backlit LCD ensures you never miss a detail, even in dim spaces.
NEXT LEVEL FAULT DETECTION - Patent-pending tech spots open neutral & ground faults others miss—safety first.
PRECISION GFCI TRIP TIMING - See exact trip times to troubleshoot with unmatched accuracy and confidence.

The Klein Tools RT250 is a professional-grade GFCI outlet tester designed for North American 3-wire 120V receptacles. Featuring a large backlit LCD, it provides clear voltage readings, identifies common wiring faults including open neutral and ground, and displays GFCI trip times for precise troubleshooting. With a CAT II 135V safety rating, auto-hold functionality, and bright LED indicators, it delivers reliable, safe, and convenient electrical testing trusted by professionals since 1857.

规格

ASIN	B08QW7K1JJ
Best Sellers Rank	#323,021 in Home Improvement ( See Top 100 in Home Improvement ) #489 in Multi Testers
Brand	KLEIN TOOLS
Brand Name	KLEIN TOOLS
Colour	Multi
Customer Reviews	4.8 out of 5 stars 10,887 Reviews
Global Trade Identification Number	00092644693212
Included Components	2 x 1.5V AAA Alkaline Batteries and Manual
Item Dimensions	11.5 x 2.9 x 5.1 Centimeters
Item Length	4.5 Inches
Item Package Quantity	1
Item Type Name	Klein Tools RT250 GFCI Receptacle Tester with LCD Display, for Standard 3-Wire 120V Electrical Outlets
Item Weight	118 g
Item Width	2 Inches
Item dimensions L x W x H	11.5 x 2.9 x 5.1 Centimeters
Key Product Features	CAT II 135V SAFETY RATING: GFCI Receptacle Tester has a CAT II 135V safety rating, ensuring reliable and safe electrical testing for various applications, CLEAR LCD READOUT: GFCI Receptacle Tester features a large backlit LCD readout for easy voltage reading and clear indication of wiring conditions, CONVENIENT AUTO-HOLD FEATURE: Auto-Hold function holds the reading for hard-to-reach outlets, prov…
Manufacturer	Klein Tools
Maximum Operating Voltage	120 Volts
Measurement Type	Voltage Tester
Minimum Operating Voltage	120 Volts
Model Name	RT250
Model Number	RT250
Package Weight	0.2 Kilograms
Part Number	RT250
Pattern	Solid
Power Source	Corded Electric
Power Source Type	Corded Electric
Size	Receptacle Tester
Special Features	Large LCD Display; Patent Pending Detection of Open Neutral Open Ground Wiring Fault; Shows Amount of Time it Takes to Trip GFCI
Specification Met	CSA
Style	Receptacle Tester
Style Name	Receptacle Tester
Title	Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red
UPC	092644693212
Unit Count	1 Count
Upper Temperature Rating	60 Degrees Celsius

J**.

Excelente.

16.03.2026

C**L

Can't go wrong with this outlet tester

15.05.2025

D**N

Simple and easy to use yet Amazing precision!!!

31.12.2025

J**Z

Funcional

Funciona perfecto y es muy práctico lo volvería a comprar

1.03.2026

F**S

Handy Tool

17.11.2025

常见问题

产品是真实而真实的吗？+

是的，所有产品均直接来自美国，英国，阿联酋和印度的授权零售商。我们保持严格的质量控制过程，并在运输前验证每种产品。所有项目都有适用的制造商保证，并由我们的标准退货政策涵盖。

交货需要多长时间，这是可靠的？+

送货时间因目的地国家 /地区不等，通常从3-9个工作日不等。每个订单都可以通过我们的系统完全跟踪。我们处理所有关闭范围，并使用可靠的快递合作伙伴进行最后一英里的交付。您将通过电子邮件和我们的应用程序定期收到有关您的订单状态的更新。

什么是凡人车？从安全订购安全吗？+

自2014年以来，落伍车是一个国际电子商务平台。我们每天在全球范围内安全地处理数千个订单。每个产品都会在交付前经过我们的质量验证过程，我们提供端到端订单跟踪，24/7客户支持以及全面的回报政策，以确保安全的购物体验。

产品定价如何计算？+

我们的价格包括产品成本，国际运输，进口关税，关税和当地交货费用。我们处理所有海关和导入程序，确保交货时没有隐藏的费用。 Pro会员将获得额外的福利，包括免费送货。

TrustPilot

TrustScore 4.5 | 7,300多个评论

尤素夫·A.

总体来说，体验非常棒。会推荐给朋友和家人。

1 个月前

Ayesha M.

产品与描述完全相符。对我的购买非常满意。

5天前

查看所有TrustPiLot评论

NT$3446

关税和税费包括

Taiwan店铺

免费退货

30天对于 PRO 会员用户

15天无会员资格

安全交易

TrustPilot

TrustScore 4.5 | 7,300多个评论

Pooja R.

客户服务超出了我的预期。非常适合购买在其他地方找不到的产品。

1 周前

安妮塔· G.

体验不错，但跟踪更新可以更好。

2 个月前

查看所有TrustPiLot评论

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

细节

描述

规格

评论

常见问题