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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

Q: 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.

Q: 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.

Q: 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.

Q: 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."

Product ID: 513814177

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Details

Brand
KLEIN TOOLS
Power source
Battery
Style
Receptacle
Colour
Orange
Item weight
0.49 Pounds

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

📺Large color LCD for clear results

🛠️Tests AFCI & GFCI with trip time display

Description

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

VOLTAGE DROP MASTERY - Load test at 12A, 15A, and 20A to quantify voltage drops and optimize electrical efficiency.
CRYSTAL CLEAR DIAGNOSTICS - Large color LCD delivers instant, easy-to-read wiring fault results—no guesswork, just precision.
PRO LEVEL FAULT DETECTION - Identify open neutral/open ground and other common wiring issues to keep your projects flawless.
ADVANCED AFCI GFCI TESTING - Measure trip time and current to ensure your safety devices perform exactly when they should.
TRUSTED LEGACY CRAFTSMANSHIP - Built by Klein Tools, a family-owned brand since 1857, engineered for professionals who demand durability.

The Klein Tools RT390 Circuit Analyzer is a professional-grade electrical tester featuring a large color LCD for easy fault identification, AFCI/GFCI trip time measurement, and voltage drop testing at multiple load levels. Designed for North American 120V outlets, it combines advanced diagnostics with rugged, trusted craftsmanship to empower electricians and managers to ensure safe, efficient wiring every time.

Specifications

Manufacturer	Klein Tools
Part Number	RT390
Product Dimensions	17.96 x 6.91 x 3.84 cm; 222.26 g
Item model number	RT390
Size	One Size
Colour	Orange
Style	Receptacle Tester w/Voltage Drop
Finish	Brushed
Material	Blend
Pattern	Circuit Analyzer
Shape	Rectangular
Power Source	Battery Powered
Item Package Quantity	1
Certification	Cat Iii 135v, Afci, Gfci, Ul, Fcc
Included Components	3 x AAA Batteries, Instructions, and Pouch
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Item Weight	222 g

Have a Question? See What Others Asked

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

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

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

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

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