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Good luck. Hopefully it's color-corrected (achromatic) in addition to spherical aberration as advertised. If it's a Hastings triplet, it should be.
I find 20x to be useful in checking the edge back-lit, so as to be in silhouette. Just be careful as you will be very close to the blade's edge in viewing. At that price, you could also pick up a lower magnification for bevel viewing by direct reflection--a decent triplet achromat in the 3x to 8x can be had for cheap in this regard. Something in the 8x to 14x range I mentioned above is a compromise, allowing both worlds (edge viewed in silhouette, bevel viewed by reflection from a key light source).
When to draw the line on micro-chipping, or the magnification revealing this, is a personal call. In the end, the shave test is the final arbiter.
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I have the same scope and you've read my mind. Field of view is too small and it's hard to use at best and impossible to adjust with one hand.
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i use a 4x and a 10x loop . i can see everything .
