Sorry about the link!
5.5 Inch LCD Digital Microscope, 1000 X 10MP 1080P Photo/Video Zoom Microscope
Yeah, you should be able to see *some* stuff with that. The amount of magnification really depends on the size of the specific phyto you're culturing. Tetraselmis are actually pretty large (so far as phyto go), but the typical green phyto (Nannochloropsis) is quite a bit smaller. I guess there is only one way to know for sure! Pop some under the scope and see if you can see anybody swimming around!
If it's Nannochloropsis, though, they aren't really motile (so far as I have witnessed, at least). They are just tiny green spheres.
If you were curious, I grow the following: Tetraselmis chui, Rhodomonas salina, Nannochloropsis occulata, Chaetoceros sp., Dunaliella sp., T-Isochrysis lutea