This is an excellent general purpose microscope. In the attached photos, the circles are 300 µm and 400 µm in diameter. For the electronics: The length of the SMD component 0204 is about 500 µm, so the increase is enough for soldering, although there is a slight delay. The microscope came with English assembly instructions which were a bit difficult to read but there aren't too many parts so it's not hard to figure out which is which. There was also a mini CD that I can't read. It's decently designed hardware, but it's "off-brand" and so I don't expect support. If you don't have a good understanding of how electronics work, I would not recommend this product.
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