Do you want to play around with a scanning microscope? Here is one made with an ESP32, some electronics and an old Blue Ray drive.
It is a pretty interesting look at the drive operation if nothing else.
It is a pretty interesting look at the drive operation if nothing else.
Turns Out You Can Turn Old Blu-Ray Players into Microscopes
For those who need more resolution than an optical microscope offers, but on a hacker's budget.
gizmodo.com