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

Product ID: 562206413

Details

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

⚡Detects wiring faults & voltage drops

📊Large color LCD for clear results

⏱️Measures AFCI/GFCI trip time

€ 635.83

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Description

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

LOAD TESTING AT MULTIPLE AMPS - Test voltage drops at 12A, 15A, and 20A loads to guarantee optimal circuit performance.
PRECISION AFCI GFCI TESTING - Accurately measure trip time and current to ensure your safety devices perform flawlessly.
INSTANT CLARITY WITH COLOR LCD - See wiring faults and voltage drops in vivid detail for faster, confident diagnostics.
SMART POWER MANAGEMENT PORTABILITY - Auto shut-off saves battery life; detachable cord keeps your toolkit sleek and organized.
DUAL FAULT DETECTION FOR ULTIMATE SAFETY - Identify open neutral and ground faults to prevent costly electrical hazards.

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 with trip time measurement, and performs load testing at 12A, 15A, and 20A. Lightweight and battery-powered with auto shut-off and a detachable cord, it delivers reliable, easy-to-interpret diagnostics for electricians and serious DIYers alike.

Specifications

ASIN	B0BT87LJRL
Brand Name	KLEIN TOOLS
Colour	Orange
Customer Reviews	4.8 4.8 out of 5 stars (317)
Global Trade Identification Number	00092644693632
Item Dimensions	18 x 6.9 x 3.8 Centimeters
Item Type Name	Building Material
Item Weight	0.49 Pounds
Manufacturer	Klein Tools
Maximum Alternating Current	20 Amps
Maximum Operating Voltage	120 Volts
Measurement Type	Analog Tester
Minimum Operating Voltage	120 Volts
Model Number	RT390
Number of Items	4
Number of Packs	1
Part Number	RT390
Power Source Type	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

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€ 635.83

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered 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 Italy.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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