Greenlee 402T Signal Generator for Tracing CATV Cable comes with a very strong signal, which can go through passive devices, such as splitters, traps or directional couplers. Because of these features Greenlee 402T is the most popular tone generator for the CATV techs and installers. The 402T tone generator comes with a LED light indicating that tone is being generated. Multiple tone feature allows for up to 4 different signal generators to be used to trace multiple cable runs. The Greenlee 402T identifies presence of AC or DC voltage, as well as resistance levels. Many experts agree that this tone generator is the best for the CATV wire and cable identification.