This is pretty neat. Plug one of these in a smart phone or at the end of an USB cable.
Now you can really see that edge you've been trying to hone.
https://phys.org/news/2017-02-microscope-dime-sized-device.html
http://ldcn-mechatronics.net/lab/wp-content/uploads/07775031.pdf
https://en.wikipedia.org/wiki/File:Atomic_Force_Microscope.ogv
Now you can really see that edge you've been trying to hone.
https://phys.org/news/2017-02-microscope-dime-sized-device.html
http://ldcn-mechatronics.net/lab/wp-content/uploads/07775031.pdf
https://en.wikipedia.org/wiki/File:Atomic_Force_Microscope.ogv