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I have one of those. Quite good for the price & shows you only need 8-10x for honing. The 30 is actually the diameter in mm's.

Wait till you get one of those 1%ers that look like a hacksaw but shave like a dream. Really messes with yer head :roflmao

My hat's off to anyone who can consistently hone by sound or feel alone. I say honing is like trading the stock market.
The more tools & indicators you can use, the more likely you will succeed. ...

There are plenty of picture threads on the forum. The one below may help. Pics are a bit higher than 10x but you should still get some ideas.

Basically you want to see an evenness all the way...