I work in an auto repair shop that has these must have little types. The problem is that they are also easy to lose. Getting them from a tool supplier every few weeks for over $7 each was exhausting. No longer! These babies are perfect. And at the perfect price. Easy to read and I don't have to guard them at the cost of my life. This 10 pack saved me a decent amount of money. Will definitely buy again if I need more. I also referred my fellow technicians to this product. Helps us all save some money for an easily lost but necessary item.