I have both of those lighted scopes MarcH posted. The “hand microscope” is a bummer because it magnifies better than anything in that price point but it inverts the image which makes using it an endlessly frustrating process in my opinion.
The “60x LED lighted jeweler’s loupe” is a great buy and I use mine just about every time I sharpen. It works well in place of a full on USB scope. You don’t get nearly as much magnification as a USB scope will give you, but it is quick, small, and a lot more effective than unaided visual inspection. That would be my recommendation for your intended use case.
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