Tasco CMT24DS Circuit Tracer Mapper is the first kind of device like this that maps branch circuits of wiring systems concurrently with a single receiver and transmitter, etc. Tasco CMT24DS circuit tracer mapper system allows for one person to identify which circuit breakers or fuses are feeding off into specific branch circuits. The CMT24DS Circuit Tracer Mapper System can test up to 96 branches concurrently, saving both time and money. Made in USA. The CMT24DS is a new and improved version of the popular model Tasco CMT24S.