Under the stylus top are phillips and flat head screwdrivers, whole on the barrel are a built-in level, ruler and 3 different scale functions. The chiseled spring clip will hold the Tool Pen™n securely in your pocket, ready to handle more jobs than any other pen! For those who love traditional writing along with their gadgets, the Tool Pen™ Fountain Pen is the one to have! For those who like the freedom to use their favorite ink cartridge but prefer the convenience of a roller pen, the Tool Pen™ is now available in InkBall as well.