250x? How does this compare with a macrophotographer’s 1:1, 2:1, etc?
A bit of math leads to an answer, in terms of the frame field of view:
The George eyeball on a real $1 bill is about 7mm wide, and fills the USB microscope frame at “50x”. A 1:1 lens turns a 24mm x 36mm object into an image on 35mm film of the same size. Thus the equivalent magnification at 50x is about 36mm/7mm ~= 5, or a 5:1 macro lens.
Bear in mind that a frame of decent 35mm film has more than 2 million pixels.
If it has decent depth of focus, and is not too heavy, it could be added to e.g. a 3d-printer tool head to monitor the work. Or to a laser cutter to both monitor the progress and to finely align the object (and possibly to autocalibrate the power and speed to match the material in use, by running a test pattern and inspecting the result and choosing the best).
FREEZE. Zoom in. And enhance.
Check if the thing can see near infrared. Then try out near-IR illumination, and a NIR filter for the microscope lens that removes visible light. A word goes around that IR-absorbing inks are used as a security measure in addition to the well known UV-fluorescing ones.
UV fluorescence microscopy could also be a fun thing to try.
Oh, that’s my camera, not this USB microscope.-- I was trying to get a handle on the 50x thing.
Ahhh. Nice, too! (And the same suggestion applies to other optics too. 
And you can make a whole-area image too.)
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