HDMI microscopes are nice, but expensive, so I built my own. It's a Raspberry Pi 4 mounted to a Raspberry Pi High Quality Camera using the PCB mount from https://www.thingiverse.com/thing:4420496/files with a 100x microscope lens https://amzn.to/3MuxPEI attached. To be able to move the camera around, i attached it to a ball-head camera wall mount like https://amzn.to/3QbjJeA and to be able to move it up and down, I attached the wall mount's plate to the pillar of an old monitor stand like https://amzn.to/3zwybrt with this hight-adjustable holder and two M3 countersunk screws. It takes an M10 machine screw and a knurled nut to fasten.