How to see sperm with a cheap microscope: Set the middle adjuster to high and put the magnification in the middle- 300-500. Then place on the sample with the plastic on top on the slide and insert the slide. place the color wheel to either green, blue, or red and then look threw the scope. Slowly focus on a bubble or something till you can see it clearly. Now look around, you should see sperm and can adjust better to see them
To see how good a sort is you need to use a microscope so you can see the layers. The top 5-20% (somewhere in there) of the egg white will be shooting star sperm- these in theory are the super x swimmers. The next layer of ew is the fast strait swimmers. Then that layer that touches ew to semen will be mixed (strait and slow). The semen layer will have slow and circle sperm. If you see black sperm this is dead sperm. Sperm that aren't moving but aren't black are not dead.
for ttc a boy you want to use the ew layer that doesn't include the top 5-20% or the part that touches semen
for ttc a girl you want to use only semen and not the part that touches the ew
Remember though this isn't 100%. And you need to do diet, supplements, pH, and ions along with it