The cheap stereomicroscopes don't have "indirect reflected light" but it's not hard at all to add a ring illuminator or just arrange a flashlight or other led l

The cheap stereomicroscopes don't have "indirect reflected light" but it's not hard at all to add a ring illuminator or just arrange a flashlight or other led light that comes in from the side. I emulate darkfield using a side illuminator all the time. You can also replace the installed LED with an LED matrix (like the tiny one adafruit sells) and just illuminate the outermost ring of pixels, this will emulate dark field mask.