Extech CT20 Remote and Local Continuity Tester - Professional Electrical Testing Tool for Wiring, Cables, and Circuits | Ideal for Electricians, Technicians, and DIY Home Repairs

I used this to locate the 2 traveler wires when working on updates to two 3 pole switches and the light they control. Saved me a lot of time and headaches. Worked GREAT!Works like a charm I highly recommendI have used this tool for 20 years - I screwed up and used it on a Live Wire (second time) - [I didn't have a fuse the first time so I jumped it with foil - the second time it broke a circuit - It's like a secondary fuse - it can be soldered - but, I'm lazy and I can't solder very well]................... this is a very simple tool so it does not need an overblown 20 paragraph or extra complicated review so this one will be simple and to the point. first this tool is designed to do a very simple job its basic job is to check circuits for electrical continuity obviously. but it does have some other uses as well it can also be used to find both sides of an electrical circuit like for instance trying to chase the traveler or common wires on a two or three way switching circuit used on things like kitchen chandeliers or ceiling fans / track lighting and such. it can also be used to localize any circuit between your main panel and any single branch circuit leaving that panel. this tool can also be used for the telephone OR H.V.A.C. industry as well. these different scenarios can be tested as well as numerous others as long as you the user makes sure that the circuit being tested no matter what the working voltage of that circuit 120 volt 240 volt or 12 to 24 volt has been disconnected or powered down before testing or you will fry this tester as it is self powered by an internal 9 volt battery. the tool has a very user friendly setup with two lights on the top of the tester one shows that the tool is turned on with the green light and the red light shows the continuity test the slider switch in the center turns the tool on or off and the little L.E.D. indicator device that is attached to the side of the unit gets removed to attach to the opposite side any circuit being tested by the main tester box. the tester box sends power to the little indicator light allowing you the user to locate both matching sides of any circuit being tested. this tool is so simple that I personally cant find any major issues with the tool but I am not a professional electrician but more of a quality oriented home handyman who specializes in electrical work and I haven't had the chance to use this tool on a major project as of yet. I personally do like the fact that extech does supply a nice heavy cloth carrying case that the device can be carried in and protected with as well . the final synopsis of this detector is that it is a very simple easy to use tool and doesn't really have any major drawbacks or technical issues known at least to me and should get the job done simply and effectively for whomever the end user is whether you are a professional or not.great tool for checking isolation in real-timecomes with a nice caseThis unit works fine for a continuity tester but because of the design I would not buy it again.They designed it to beep on and off when there is continuity.I prefer a constant beep when there is continuity.If there is a break in the wire you are testing how do you know if it's the wire causing it to not beep or the beeper just cycling on/off.Works well!A colleague had one of these & recommended it to me. For tracing cables, polarity etc it’s absolutely amazing. No more 2 man or backwards & forwards terminal blocking to trace continuity. Highly recommend.If you just want to use a continuity tester this is very good, with an audible and light indication.Good, light , portable, functional little gadget. I bought, I liked , I reviewThis was better than I expected and well worth the price.Good tester saved day on miss numbered cat6A in loom of 24 ✋?