Can this device be used to test the continuity of a single conductor wire instead of a conductor pair?

I wondered about that too so I asked my son in law he's an electrician according to him you can't do it remotely but it can be done without the remote option as long as you can get to both ends of the single wire which makes this device useless in most cases because most of the wires I would want to remotely test are single wire

how many feet can be tested at one time ?

Not sure what your asking about how many feet? It is for finding continuous flow in wiring if your not sure which wire goes where. This is a video I used to help me to figure out a 4 way switch setup. http://www.thisoldhouse.com/toh/tv/ask-toh/video/0,,20785338,00.htmlHope it helps.

Hooking tester in panel box is a probl locating grnd and neg. Can you attach rem to grounding bar to test for neg and grounding wire continuity?

You can test everything you want as long as the object that you want to test is de-energized

do the units require any kind of recalibration or servicing to ensure it is still working correctly

No, none that I know of. It works fine and comes with instructions. It saves a lot of time and trouble, especially if you are working alone.

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Extech CT20 Remote and Local Continuity Tester with Remote Probe

Extech CT20 Remote and Local Continuity Tester with Remote Probe

Product ID: 2175252

Details

Brand
Extech
Color
green
Item Weight
0.1 kg
Power Source
Battery
Style
CT20

💡Bright LED indicators for clarity

📏Tests cables up to 10,000 ft

🔊85dB loud audible beeper

Rp2105778

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔌 Master your wiring game with the CT20—where precision meets solo power!

COMPACT POWERHOUSE - Lightweight and portable design fits in your toolkit without weighing you down.
SOLO CABLE MASTERY - Detachable remote probe enables one-person operation across long distances—no assistant needed.
BUILT FOR THE FIELD - Rugged housing and professional alligator clips ensure durability and secure connections on-site.
PRECISION IN EVERY SIGNAL - Dual LED and audible alerts cut through noise for instant, reliable continuity confirmation.
EFFORTLESS LONG RANGE TESTING - Perfect for tracing wires across rooms, floors, or entire buildings—save time on complex jobs.

The Extech CT20 Remote and Local Continuity Tester is a professional-grade tool designed for electricians and technicians to quickly and accurately test cable continuity up to 10,000 feet. Featuring a detachable remote probe for single-user operation, bright LED and loud audible indicators, and a rugged build, it streamlines troubleshooting across large installations, automotive circuits, and home wiring projects. Compact and battery-powered, the CT20 delivers dependable performance in noisy, demanding environments.

Specifications

ASIN	B000LYTTRK
Best Sellers Rank	#198,896 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #287 in Multi Testers
Brand Name	Extech
Color	green
Customer Reviews	4.5 4.5 out of 5 stars (2,000)
Global Trade Identification Number	00793950000205
Included Components	Product & Instructions Guide
Item Dimensions	2.2 x 1.14 x 3.6 inches
Item Weight	0.1 kg
Manufacturer	Extech
Measurement Type	Ohmmeter
Model	CT20
Number of Items	1
Part Number	CT20
Power Source	Battery Powered
Style Name	CT20
UPC	013161042406 793950000205
Unit Count	1 Count
Upper Temperature Rating	149 °F
Warranty Description	1 year

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