The Klein Tools Replacement Lead Kit for TDR Cable Length Meter is comprised of 5 lead types for use with the TDR Cable Length Meter (Cat. No. 501-915). Designed to measure cable length, calibrate Velocity of Propagation (VoP) values, find distance to faults, with built-in tone generation for cable tracing (tracing proble Cat. No. VDV500-123 sold separately) for a wide variety of cable types. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.