Tasco CMT24S Circuit Tracer Mapper is the first device of its kind that maps branch circuits of wiring systems concurrently with a single transmitter and receiver, etc. Tasco CMT24S circuit tracer mapper system makes it possible for one person to identify which circuit breakers or fuses are feeding specific branch circuits. The CMT24S Circuit Tracer Mapper System tests up to 96 branches concurrently, saving time and money. Made in USA