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I like and use these two. The Carson MM200 and the 60x lighted loupe.

You can buy the Carson for 10-15 bucks and the 60X for as low as $2.

Both work well, the Carson takes a bit of getting...

Use a good lighted loupe or scope to look at your edge before you strop and after, this will tell you if you are making progress or damage.

Stropping is the Catch 22 of Straight Razor maintenance....