The Ideal Industries 61-063 Volt Sensor is a non-contact, pen-style voltage tester for reading hot wires with respect to ground, with a voltage range of 40VAC to 600VAC maximum to ground. A red flashing LED and continuous beeping indicate the presence of live voltage. The tester meets International Electrotechnical Commission (IEC) 61010-1 Category III 600V, Pollution degree 2 in accordance with IEC 664, indoor use. Voltage testers detect electrical current in cables, cords, circuit breakers, switches, wiring, and other components of electrical systems. They can test for live circuits, proper grounding, adequate voltage, and flowing current. They might be used by homeowners to test electrical outlets or by linemen to test power lines. Available in a variety of styles and levels of sophistication, some models simply indicate the presence of electrical current, while others record or display the level of voltage conducted. Some have additional capability such as the ability to perform continuity tests.Ideal Industries manufactures test and measurement equipment, electrical supplies, and tools, among other products. The company, founded in 1916, is headquartered in Sycamore, IL.What's in the Box?