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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Specifications

Brand	KLEIN TOOLS
Power Source	Battery Powered
Style	Receptacle Tester w/Voltage Drop
Color	Orange
Item Weight	7.84 ounces
Item dimensions L x W x H	10 x 10 x 10 inches
Min. Operating Voltage	135 Volts (AC)
Specification Met	Cat Iii 135v, Afci, Gfci, Ul, Fcc
Upper Temperature Rating	55 Degrees Celsius
Measurement Type	Voltmeter, Ammeter, Ohmmeter, Time-based
UPC	092644693632
Manufacturer	Klein Tools
Global Trade Identification Number	00092644693632
Part Number	RT390
Item Weight	7.8 ounces
Product Dimensions	10 x 10 x 10 inches
Item model number	RT390
Size	One Size
Finish	Brushed
Material	Blend
Pattern	Circuit Analyzer
Shape	Rectangular
Item Package Quantity	1
Included Components	3 x AAA Batteries, Instructions, and Pouch
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline

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