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The CT20 is an electronic tool for electricians, alarm, cable installers and others who routinely need to check circuits for continuity and also identify cables and wires. It allows a single user to quickly identify and label two wires even when the wire ends are located in different rooms. It can accommodate test wire lengths up to 10,000-feet (3,000 meters), 26-gauge minimum. The CT20’s Remote Continuity mode allows the user to check continuity and to identify two or more cables/wires simultaneously.
From the Manufacturer
An electronic tool for electricians, alarm, cable installers and others who routinely need to check circuits for continuity and also identify cables and wires. It allows a single user to quickly identify and label two wires even when the wire ends are located in different rooms.85dB beeper. Tests wire lengths up to 10,000-Foot (3,000m) 26 gauge minimum. CE approved. Complete with Continuity Tester, Remote Probe with Bi-Color LED, 9V battery, and carrying case.
marlon hardy
Reviewed in the United States on April 2, 2025
Thanks worked great
Linda
Reviewed in the United States on September 6, 2024
Extremely useful tool to figure out old house wiring, inexpensive too
pda
Reviewed in the United States on August 3, 2024
Contractor hard wired Ethernet to each room, but did not label wires in the termination point. Quick and easy way to figure out which wire leads to which room.
Baptiste GILLES
Reviewed in France on March 29, 2024
J'ai récemment acheté ce testeur de continuité sans fil et je dois dire que je suis extrêmement impressionné par sa performance. Tout d'abord, sa compacité le rend très pratique à transporter, ce qui est un énorme avantage pour moi car je suis constamment en déplacement sur différents chantiers.En ce qui concerne sa fiabilité, je n'ai rencontré aucun problème jusqu'à présent. Il détecte efficacement la continuité et ce que j'apprécie le plus, c'est qu'il donne également la polarité grâce à la couleur du voyant allumé. C'est un détail ingénieux qui rend l'utilisation de cet outil encore plus intuitive.En plus de cela, sa construction est solide et bien conçue, ce qui le rend durable et prêt à résister à une utilisation régulière sur le terrain. Je peux vraiment compter sur lui pour effectuer mes tests électriques en toute confiance.En résumé, ce testeur de continuité sans fil est un outil indispensable pour tout professionnel ou bricoleur sérieux. Compact, fiable, et offrant des fonctionnalités supplémentaires telles que la détection de polarité, il est vraiment bien sous tous les rapports. Je le recommande vivement à tous ceux qui recherchent un outil pratique et performant pour leurs travaux électriques.
B. Cragg
Reviewed in Canada on February 13, 2024
This tool is a bit pricey, but it has paid for itself for me in terms of time savings. It makes identifying mystery wires very simple. It's a great tool to have for any rewiring project.
Richard
Reviewed in the United States on October 27, 2024
DOES NOT WORK AFTER SITTING FOR A YEAR.
Tim
Reviewed in the United States on April 12, 2024
A must have for troubleshooting. Saves lots of time from guessing which wire is which
Mark
Reviewed in the United States on August 13, 2023
I recently purchased the Extech CT20 Remote and Local Continuity Tester in green, and I'm generally satisfied with its performance. I would rate it 4 out of 5 stars.The continuity tester serves its purpose well, allowing me to quickly check for continuity both remotely and locally. The convenience of this dual functionality is a significant advantage, making troubleshooting tasks more efficient.However, I do share the sentiment that the overall quality of the tester could be improved. It gives the impression of being slightly less robust than I had hoped for, which could affect its durability over time, especially with regular use.On the positive side, the tester is user-friendly and straightforward to operate. The green color is a nice touch, making it easy to spot in a tool bag or workspace.I'm particularly pleased with the accurate results and the tester's reliability in detecting continuity issues. It's a valuable tool for anyone dealing with electrical or wiring tasks, contributing to a smoother and more efficient workflow.In conclusion, the Extech CT20 Remote and Local Continuity Tester is a reliable tool that gets the job done. While the quality could be a bit better, it offers accurate results and convenient dual functionality. If you're in need of a continuity tester for your electrical work, this Extech CT20 model is a suitable choice that delivers on its intended purpose.Sincerely,Mark
Luis Dávila
Reviewed in Mexico on January 5, 2023
Facilita mucho el trabajo
Woodshop Man
Reviewed in the United States on July 31, 2019
I have an old one of these; a Sears Craftsman. Exactly the same, down to the letter. The leads to the battery finally broke off and I decided not to try to repair it, but buy a new one.I'm in the process of remodeling my home; well, with the help of a contractor and a crew of guys!I had a lot of Romex cable running to and from places, just stopping or connected up to something for some unknown reason. I'm using this Extech (and my old Sears) to track down which wires go where. It is a simple principal; the device just sends a small charge from the 9 volt battery through two wires (hot and neutral as an example) and ifit's the same hot neutral at the other end, the light and buzzer lets you know.Now REMEMBER, TURN OFF THE POWER! Get an A/C tester, like the Klein, so you don't get a shock.Great product!
Robotukas
Reviewed in the United Kingdom on August 27, 2018
Poorly made. I don’t mind to pay more when it does a great job. This product is poorly made and not worth to spend money on it.
James W. Densford III
Reviewed in the United States on January 6, 2016
I bought this several months ago, and used it for the first time yesterday. This is a great, labor saving device. You can use the basic tester to determine continuity very quickly -- great for checking incandescent lights, switches, etc. For long wire runs, just connect the tester to one end of a set of two wires, and connect the remote indicator to the other end. The remote indicator does not light if you have the wrong wires, lights up red if you have the right wires but are reversed from the tester at the other end, and lights up green if everything is good. I have a couple of very minor gripes - the tester is only for use with non-energized wires, and should have come with probes as well as alligator clips for access to electrical outlets. All-in-all, a great, reasonably priced product.
ローテクおやじ
Reviewed in Japan on February 8, 2015
両端での線の正逆が簡易的に確認できるのでその点は他のチェッカーより優れていると思う。電源スイッチは忘れずに切らないとかなり早い段階でバッテリーがなくなる。音が少し小さめかなと思う。うるさい現場では少し聞き取りにくいかもしれない。総じて良くできている。
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