I have read that a 400x magnification is right for counting yeast on a hemocytometer, and also using dye to check vitality.
I'm looking at using a cheap portable $50 USB microscope. They are rated up to 800x magnification. I suspect that the advertised magnification also factors in digital zooming on these devices. Digital zooming is not magnification. They also seem to have cameras that say 3M or more with interpolation when they are actually 2M or less cameras.
Has anyone tried using these to count yeast? Would I be better of investing in a regular microscope, and buying a camera to fit it?
I will probably buy the cheap USB microscope anyway for other uses like electronics.