This instrument combines 3 tools in one easy to use unit

This digital 3-In-1 Stud/Voltage/Metal Detector from General Tools offers the use of three valuable tools at your disposal in one compact unit. Ideal for electrical and construction trades, as well as inspection and household use, the unit enables you to easily and quickly detect wood and metal studs, metal pipes and conduits, and voltage carrying objects. Advanced CPU technology delivers accurate results, displayed on a LCD screen. The unit also features an audible alert signal.