Extech CT20 Remote and Local Continuity Tester with LED Indicator - Professional Electrical Circuit Tester for Home, Automotive, and Industrial Use - Green

................... 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.