Just picked one up. For the price, I couldn't refuse. Will update this post when it gets here with my impressions.
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I always liked the Radioshack model, it goes all the way to 100x and does so quite clearly.
I have and use a 10x illuminated loupe and a 60x mini microscope like this Mini 60X illuminated jeweler's microscope (loupe) | eBay. Now I may just purchase the 30x.
I have an inexpensive 100x variable hand held microscope and a 14x B&L hastings triplet loupe. I mostly use the loupe due to the ease of use. It does the job most of the time but when I have trouble honing an edge I get out the microscope to really see what the edge looks like close up. It does take much more light for the 100x so I use an led flashlight in addition to the built in light.
I ordered this 30x Illuminated off Amazon for $3 http://www.amazon.com/SE-30X-Illumin...5736108&sr=1-1 Do you think this will be sufficient or will I need a more powerful magnifier?