To be honest, this product is probably OK for the price, but not more. The optics are primitive, as is the PC software.
There is no separate focussing facility. To focus, you must first set the magnification level you want, then move the microscope towards or away from the subject until it comes into focus. You may need to repeat this process a few times until the picture is as you want it.
Focussing at the both extremes of the magnification is quite tricky, and at large magnifications there are actually two focal points.
Maybe this is par for the course for USB microscopes, but to be honest I was a bit disappointed, whilst still recognising that it's probably what you should expect for the price.
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