Pencils & Eyebrow Pen Sharpener

Tomorrow I'll spend most of the day at a Hilton hotel. I'll attend a Notary Public class and afterwards I'll take the Notary Public Exam. It's work related. The instructions are very specific on what items I'm allowed to bring to the exam. When it comes to pens for example, I'm allowed to bring two pencils size 2. Good I've a school age child who has pencils in all different sizes. To find a sharpener is harder. I guess my eyebrow pen sharpener will do. It would be easier if we could bring mechanical pencils. I wonder why we can't? Anyone?