Microscope for stylus inspection


What power of magnification is adequate to determine stylus wear?
I purchased a 30X hand-held scope and checked my stylus.
It looks "as-new" i.e., like a perfect cone (Sumiko Blue Point Special).
There are no obvious flats on the sides and all seems to be fine.
I could see where the technician polished the sides and left the 0 and 180 degrees points a little "rough" as they never touch the vinyl.
Does this sound O. K. or do I need a more powerful scope?
128x128dweller
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I've looked at styli with special stereoscopes designed for the task. With my untrained eye, I could not really see wear that my ears clearly said was there. The dealer with the scope also pronounced healthy cartridges that I thought were clearly worn (or had other problems like the elastomer in the suspension going bad, etc.).

The short of this is that one's ears are clearly superior to any visual inspection short of something exotic (like a scanning electron microscope).
Larryi: I'm just worried that I may be using a stylus that is causing damage to my records.
I purchased a used record the seller claimed was "mint -" which had significant groove damage (crispy crackling) on both of the final (inner) tracks.
The seller said he was using a better cartridge/turntable which had been professionally set up.
I agree you have to trust your ears but when the damage is done it's done.
I'm pretty confident that what I'm seeing though my budget scope is a healthy "needle".
Thanks to both for the input.