Heathkit ET-3100 Electronic Design Experimenter with Manual as shown in the pictures. The ET-3100 still looks brand new. Everything has been tested and works great. The manual is in excellent condition with check marks by each step. Also includes the illustration booklet. The ET-3100 has square and sine wave signal sources, variable positive and negative up to 15 volts dc power supplies, a 15 or 30 volt ac power supply and 1k and 100k linear potentiometers. We have several courses for the ET-3100 and other trainers available in our auctions this week. Will gladly combine shipping for multiple items won.