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, AFCI and GFCI Tester

Product ID: 509901809

Details

Brand
KLEIN TOOLS
Color
Orange
Item Weight
7.84 ounces
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 open ground/neutral

S$289

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Description

⚡ Power Up Your Safety Game with Klein’s RT390 — The Ultimate Circuit Analyzer for Pros Who Demand More

INSTANT VISUAL CLARITY - Large, vibrant color LCD delivers easy-to-read wiring fault and trip time results—no guesswork, just confidence.
PRECISION LOAD TESTING - Measures voltage drop under 12A, 15A, and 20A loads to pinpoint performance bottlenecks before they become costly problems.
SMART POWER MANAGEMENT - Auto power-off after 5 minutes preserves battery life so your tool is ready when you are—no downtime, no hassle.
PROFESSIONAL GRADE DURABILITY - Detachable cord and rugged design built for the demands of electricians, inspectors, and serious DIY pros alike.
COMPREHENSIVE SAFETY ASSURANCE - Detects both AFCI and GFCI faults plus dual wiring issues, ensuring your electrical systems meet the highest safety standards.

The Klein Tools RT390 Circuit Analyzer is a professional-grade electrical tester designed for North American 120V AC outlets. Featuring a large color LCD, it identifies wiring faults including open ground and neutral, tests AFCI and GFCI devices with trip time measurement, and performs voltage drop tests at multiple load levels (12A, 15A, 20A). Its detachable cord and auto power-off enhance usability and battery life, making it an indispensable tool for electricians, inspectors, and serious homeowners focused on electrical safety and performance.

Specifications

ASIN	B0BT87LJRL
Best Sellers Rank	#38,168 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #64 in Circuit Testers
Brand	KLEIN TOOLS
Brand Name	KLEIN TOOLS
Color	Orange
Customer Reviews	4.8 out of 5 stars 310 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	7.84 ounces
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_of_alternating_current
Model	RT390
Number of Items	1
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 Count
Upper Temperature Rating	55 °C
Warranty Description	Please refer to attached warranty document.

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TrustScore 4.5 | 7,300+ reviews

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S$289

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered 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 SINGAPORE.

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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