does this actually place a load on the circuit for for voltage drop?

It simulates a 12,15, and 20 amp load and displays the percentage drop, according to the operating instructions.

Will this indicate open neutral or open ground when circuit is not energized?

Way late on answer this. If you’re talking about (Klein Tools RT210 Outlet Tester) then no, it has to have power on the circuit as this is not battery powered to show the tester how it’s wired.

Does this simulate and test both serial and parallel arc fault conditions?

This tester plugs into an outlet on the circuit under test, so it seems to me that automatically makes it a parallel device. Therefore it can only simulate an arc fault such as might occur in a parallel device, i.e. what you normally plug into an outlet. (A typical faulty item being be a lamp with a frayed power cord.) I believe the tester would have to be wired into the circuit in series to simulate a serial arc fault. I don't know the nature of the tester's design but it may be that tripping an AFCI unit (an AFCI outlet, for instance) with a parallel fault simulation may also prove the AFCI's ability to respond to a serial arc fault, at least in part. Disclaimer: I'm not an electrician or EE so you may want to dig farther on this subject, but I believe I have the basics right.

Does this protect trip a gfci protected receptacle with an open ground?

No it will not. No tester will trip a GFCI with open ground. You have to use the button on the receptacle/breaker in that case. Make sure the outlet is labeled with "no equipment ground."

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time, Orange

Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time, Orange

Product ID: 513814177

Details

Brand
KLEIN TOOLS
Colour
Orange
Item weight
222 g
Power source
Battery
Style
Receptacle

⚡Measures voltage drop at 12A, 15A, 20A loads

📺Large color LCD for clear results

⏱️Displays AFCI/GFCI trip time & current

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

₨11883

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

Description

⚡ Power Up Your Precision – Test Smarter, Work Safer!

ADVANCED AFCI GFCI TESTING - Measure trip time and current to ensure your outlets meet the highest safety standards.
COMPREHENSIVE WIRING FAULT DETECTION - Identify open neutral, open ground, and other common wiring issues effortlessly.
INSTANT CLARITY WITH LARGE COLOR LCD - See wiring faults and test results at a glance—no guesswork, just precision.
TRUSTED PROFESSIONAL GRADE SINCE 1857 - Crafted by Klein Tools, a family-owned brand synonymous with durability and accuracy.
VOLTAGE DROP TESTING AT MULTIPLE LOADS - Test under 12A, 15A, and 20A loads to guarantee optimal circuit performance.

The Klein Tools RT390 Circuit Analyzer is a professional-grade tester designed for North American 120V AC outlets. Featuring a large color LCD, it identifies common wiring faults, inspects AFCI and GFCI devices with trip time and current display, and measures voltage drop under multiple load conditions. Lightweight and battery-powered, it delivers trusted accuracy and durability from a family-owned brand with over 160 years of expertise.

Specifications

ASIN	B0BT87LJRL
Brand	KLEIN TOOLS
Colour	Orange
Customer Reviews	4.8 4.8 out of 5 stars (271)
Global Trade Identification Number	00092644693632
Included Components	3 x AAA Batteries, Instructions, and Pouch
Item Dimensions	18 x 6.9 x 3.8 centimetres
Item Type Name	Circuit Analyzer
Item Weight	222 g
Manufacturer	Klein Tools
Manufacturer Part Number	RT390
Maximum Operating Voltage	120 Volts
Measurement Type	Voltmeter, Ammeter, Ohmmeter, Time-based
Minimum Operating Voltage	135 Volts (AC)
Model Number	RT390
Power Source	Battery Powered
Specification Met	Cat Iii 135v, Afci, Gfci, Ul, Fcc
Style Name	Receptacle Tester w/Voltage Drop
UPC	092644693632
Unit Count	1.0 count
Upper Temperature Rating	55 Degrees Celsius

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

₨11883

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

View all Trustpilot reviews