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."

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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

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 and current

E£ 59578

Duties & taxes included

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Description

⚡ Power Up Your Precision — Test Smarter, Work Faster!

VOLTAGE DROP NO PROBLEM - Load testing at multiple amperages reveals hidden voltage drops that can sabotage your system.
MASTER AFCI GFCI TESTING - Accurately measures trip time and current, ensuring your safety devices perform perfectly.
SEE EVERY DETAIL INSTANTLY - Large, vibrant color LCD makes complex wiring diagnostics effortless and fast.
BUILT TO OUTLAST THE JOBSITE - Rugged, battery-powered design from a trusted 160+ year-old brand means reliability you can count on.
PINPOINT WIRING FAULTS LIKE A PRO - Detects open neutral/open ground and other common wiring issues to keep your projects flawless.

The Klein Tools RT390 Circuit Analyzer is a professional-grade electrical tester featuring a large color LCD for easy-to-read diagnostics. It identifies common wiring faults, inspects AFCI and GFCI devices with trip time and current display, and measures voltage drop under 12A, 15A, and 20A loads. Designed for North American 120V AC outlets, this battery-powered tool combines durability and precision from a trusted 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 (298)
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
Number of Items	1
Number of Packs	1
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

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