How could you use this to test a 50 amp plug in for an RV at campgrounds - use an adapter changing the 110 to 50 and if so does that work?

The unit only tests for the existance of 60Hz power on a particular wire Amps don't matter A 50 Amp plug is 240v It has 2 hot lines at 120v each and 1 neutral and 1 ground Sometimes neutral and ground are the same with only 3 blades on the plug Anyway, bringing the tester near the outlet will tell you if it's live it won't tell you if there is a problem like one hot line being out or low voltage on either leg You would need a multi-meter and some training to do anything else A good poor man's tester is an old fasioned lightbulb 60w across one hot leg and neutral then the other hot leg and neutral If the brightness is the same for both then you're good

What does a reading of flashing red light indicate when plugged into a replaced gfi outlet? a green light indicated "correct" wiring. two other outle

The gfi is not working or the gfi is faulty to begin with.

Downloaded the operating instructions, but still cannot figure out how to install the lr44 battery?

Hello, Thanks for your inquiry. On the backside of the tester there should be a polarity indicator on the tester and on the inside of the battery compartment.

can you use this for break point testing of wires?

It is designed for live wire break point testing, but this isn't a TDR. (time domain retroreflector) It is a very high quality device, that is prices remarkably low. I keep this in my go toolbag and find its very rugged and convenient.

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Description

Save time and money with 2 popular testers in 1 unit - featuring a non-contact voltage detector on one end and gfci outlet tester on the other
Bright 360 degree viewable led indicator lights
Single led provides immediate indication of the wiring error, no need for a chart to carry, memorize or interpret!
Beeping audible indicator confirms presence of voltage or gfci test completion
Advanced ground testing circuitry precisely detects the required low resistance values

SPERRYInstruments VD7504GFI DualCheck 2-in-1 Non-Contact Voltage Detector + GFCI Outlet Circuit Analyzer, 360° Visual & Audible Indicators, 50-1000V AC, 250 lb. Crush Rating

Specifications

Brand	SPERRY
Power Source	Corded Electric
Style	Non-Contact Volt Tester & GFCI Tester Combo
Color	0.6
Item Weight	0.02 Pounds
Item dimensions L x W x H	8.4 x 3.7 x 0.6 inches
Min. Operating Voltage	5E+1 Volts (AC)
Specification Met	Osha
UPC	032076922122 372657546706
Manufacturer	Actuant
Global Trade Identification Number	00032076922122
Part Number	VD7504GFI
Item Weight	0.32 ounces
Product Dimensions	8.4 x 3.7 x 0.6 inches
Country of Origin	China
Item model number	VD7504GFI
Batteries	1 LR44 batteries required. (included)
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Zinc
Average Battery Life	50 Hours

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