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I made a poor man's digital microscope from a small 4k camera that has an adjustable lens and an HDMI output, and a 14" desktop display that I mounted on the table in a tilted position using a VESA mount that has an adjustable arm which can be locked into place. I mounted the camera with a 3D printed part on an upcycled IKEA lamp arm which enables working with large boards. As I had all the stuff as spare already, the only real cost was the 3D printed part (around $4 USD) and one evening's work time. It has better quality than any real digital microscope I've had and old unused parts received a new life.

I would like to see how well each images sharpening knife blades. Also imaging blades slicing thru things like tomatoes.

Thanks. Decided on the TOMLOV Autofocus 4K Digital Microscope, 8" TM4K-AF Flex Arm HDMI Micro Soldering Microscope for $339.99

720p is not HD!!