The Klein Tools Advanced Circuit Tracer Kit plus Non-Contact Voltage Tester is a professional tool for tracing energized and non-energized breakers, fuses, and wires, with adjustable sensitivity to detect signals through various materials. The non-contact voltage tester detects standard voltage. It includes a transmitter, receiver, multiple adapters, non-contact voltage tester, and a durable carrying case. 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.