ELENCO 75-in-1 Electronic Project Lab Kit
By Elenco (MX-905)
Learn basic principles of electricity, electronics, physics and magnetism. It includes everything you need to build: Timer buzzer, electronic organ, motion detector, voltage detector, logic tester and many, many moretester and many, many more. Illustrated, lab-style manual included. Requires four "AA" batteries (not included). Mfr. #MX-905.