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 for voltage drop

📺Large color LCD for clear diagnostics

🔍Dual wiring fault detection including AFCI & GFCI

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Description

⚡ Diagnose Like a Pro, Protect Like a Boss!

POWERFUL LOAD TESTING - Measures voltage drop under 12A, 15A, and 20A loads to pinpoint hidden electrical inefficiencies.
INSTANT VISUAL CLARITY - Large, vibrant color LCD delivers easy-to-read, detailed wiring fault results at a glance.
SMART EFFICIENT DESIGN - Auto power-off conserves battery life; detachable cord ensures tidy storage and flexible use.
COMPREHENSIVE SAFETY ASSURANCE - Detects complex wiring faults including open neutral/ground and tests AFCI/GFCI trip times for ultimate protection.
BUILT FOR PROFESSIONALS TRUSTED BY EXPERTS - Rugged build quality and precise diagnostics make it the must-have tool for electricians, inspectors, and serious DIYers.

The Klein Tools RT390 Circuit Analyzer is a professional-grade electrical tester featuring a large color LCD for clear fault identification, advanced AFCI and GFCI testing with trip time measurement, and multi-level load testing to detect voltage drops. Designed for North American 120V AC outlets, it offers dual wiring fault detection and a durable, user-friendly design with a detachable cord and auto power-off. Ideal for electricians, inspectors, and serious homeowners aiming to ensure electrical safety and performance with precision and confidence.

Specifications

ASIN	B0BT87LJRL
Best Sellers Rank	#34,966 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #58 in Circuit Testers
Brand	KLEIN TOOLS
Brand Name	KLEIN TOOLS
Color	Orange
Customer Reviews	4.8 out of 5 stars 272 Reviews
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
Item dimensions L x W x H	7.07 x 2.72 x 1.51 inches
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	Receptacle Tester w/Load Test
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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