Perfect tool for checking your edge! When honing a Straight Razor, you need to be able to see the bevel in detail so you know when you are able to move on to the next Grit level. Once you know the bevel has an equal grain pattern then and only then are you able to go up to the next stone. Like all the products in the restoration section, I have had to test several Microscopes and hand held magnifiers until I came across a few products that are perfect for the job. This is without a doubt one of the better loupes. It's LED light makes it easy to see no matter the amount of light around you. 40x lets you see the bevel blown up and in detail.