The Global Specialties PB-503A Desktop Analog and Digital Design Trainer is designed for all levels of electronics instruction and prototyping. Utilizing the PB503A, students can create and implement their own circuits onto the breadboard, which is removable for multiple student usage in lab settings. For both series and parallel circuits, the PB503A can also handle much more sophisticated multi-stage microcomputer circuits. Multiple features in one complete test instrument can save hundreds of dollars necessary when purchasing individual units.