Your Ideal troubleshooting solution. Designed to find a variety of issues, while saving you time and money. Finds breakers and fuses, splice errors, dead shorts, wires in walls ceilings and floors, and buried conductors. Works on energized or de-energized circuits (0-600V AC/DC). IDEAL INDUSTRIES INC. SureTrace Circuit Tracers feature a rotating display. Regardless of the position the tracer is in, the display will orient itself in an easy-to-read vertical position. Audible indication intensifies in tone/pitch with signal strength. The circuit tracer also features super-bright OLED display which indicates a numeric value between 0 and 99, providing a quick and easy way to determine signal strength. Long battery life allows for 25 hours open circuit testing or 6 hours short circuit tracing. Easy-to-replace AA batteries provide the tracer with 4 times the tracing power.