“The 9420’s are an awesome tool to use with circuit training! I teach basic circuits through to more complicated motor starter circuits. This is perfect for using after walking through a circuit on the board. I bring the apprentices back and have them wire the circuit from start to finish. The 9420 “tile trainer,” as we call it, has been the Ah-Ha moment for so many of the apprentices while learning circuits. The unit allows a great deal of flexibility, so much more than the old light bulb boards that I learned on.”