This lab is a fun and easy way to demonstrate a few concepts concerning atomic structure namely the modern view of the atom (simplified) and Heisenberg's Uncertainty Principle. the students will need only the provided target diagram and a pen, though they may go through several pens. I used the cheap pens with the fine points. You can use cheap markers just make sure you have enough of them as the tips tend to break. Use fine tip markers this reduces the amount of splatter that can occur. This activity is easily modified for differentiation. You can ask me for suggestions when you purchase. i find that this lab is best if done on an individual basis. It also helps them with their graphing and basic math skills.