Ideal for analog, digital, and microprocessor circuits. High and low buffered logic indicators.  channel logic monitor.  selectable logic switches. Function Generator with continuously variable sine, square and triangle waveforms and TTL pulses. Triple output power supply offers fixed 5VDC supply plus two variable outputs: +-1 to +-15VDC. Two open collector output pulsers. Audio experimentation speaker. Removable breadboard area and optional additional breadboard socket plates. Multiple features in one complete test instrument saves hundreds of dollars needed for individual units. #104-5031.