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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Circuit Analyzer with Large LCD

Product ID: 509901809

Details

Brand
KLEIN TOOLS
Color
Orange
Item Weight
0.49 Pounds
Power Source
Battery
Style
Receptacle

⚡Load testing at 12A, 15A, 20A

📺Large color LCD for clear results

🛡️Dual wiring fault detection & AFCI/GFCI testing

1329107Fr

Duties & taxes included

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Description

⚡ Power Up Your Precision: The Ultimate Circuit Analyzer for Pros Who Demand More

DUAL FAULT DETECTION - Identify open neutral and open ground faults for unmatched safety assurance.
POWERFUL LOAD TESTING - Test voltage drops under 12A, 15A, and 20A loads to ensure peak electrical performance.
EFFORTLESS PORTABILITY - Detachable cord and auto power-off keep your workflow smooth and battery life long.
SEE FAULTS IN FULL COLOR - Large, vibrant LCD display makes wiring faults instantly clear—no guesswork.
SMART AFCI GFCI INSPECTION - Measure trip time and current to verify critical device functionality with precision.

The Klein Tools RT390 Circuit Analyzer is a professional-grade tester designed for North American 120V AC outlets. Featuring a large color LCD, it detects wiring faults including dual faults, inspects AFCI and GFCI devices by measuring trip times, and performs load testing at 12A, 15A, and 20A to assess voltage drops. Compact and battery-powered with a detachable cord and auto power-off, it delivers reliable, easy-to-interpret diagnostics trusted by electricians since 1857.

Specifications

ASIN	B0BT87LJRL
Best Sellers Rank	#26,687 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #48 in Circuit Testers
Brand Name	KLEIN TOOLS
Color	Orange
Customer Reviews	4.8 4.8 out of 5 stars (282)
Global Trade Identification Number	00092644693632
Included Components	3 x AAA Batteries, Instructions, and Pouch
Item Dimensions	7.07 x 2.72 x 1.51 inches
Item Type Name	Building Material
Item Weight	0.49 Pounds
Manufacturer	Klein Tools
Measurement Type	Voltmeter, Ammeter, Ohmmeter, Time-based
Minimum Operating Voltage	135 Volts (AC)
Model	RT390
Part Number	RT390
Power Source	Battery Powered
Specification Met	Cat Iii 135v, Afci, Gfci, Ul, Fcc
Style Name	Receptacle Tester w/Load Test
UPC	092644693632
Unit Count	1.0 Count
Upper Temperature Rating	55 Degrees Celsius
Warranty Description	Call vendor for warranty

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