What an amazing guy Mike is! He is just so talented at fixing and making things. He has many projects on his list already this summer, and he never stops! He's been working on designing and creating this amazing part at work. He literally designed and found every part for this tester. The easy explanation for everything you see is that this product was made to test the functionality and safety of the circuit breakers (the blue and green piece.)

He had to research and buy every little part, and he had to make a lot of what you see below from scratch. The clear door is a safety measure so that no electricity can pass through until the lid is closed.

These pegs hold the circuit breaker in place.
Then he did ALL of the wiring for each button. Check out the complexity of it! Yet, you will notice that it is very organized and neat. Mike has such talent for making things just look good and work efficiently. He's the best!