I made the video above. Here are more photos of a 2cm wide board taken with the 4 units:
Andonstar ADSM302 taken @ 20.5cm
Andonstar ADSM201 taken @ 12cm
2.5" "Koolertron" Microscope taken @ 11cm with no light
2.5" "Koolertron" Microscope taken @ 11cm with light at lowest setting
4.3" "Koolertron" Microscope taken @ 21cm