A microhematocrit centrifuge is used for small-volume blood testing where sealed capillary tubes are spun to separate packed red blood cells from plasma for hematocrit or PCV reading.

When comparing a microplate centrifuge vs centrifuge, the key question is not only speed. 

A PCR plate centrifuge is used for short spin-down steps in PCR, qPCR, and high-throughput molecular biology workflows. 

For molecular biology labs, a high-speed centrifuge is often used for bacteria pellets, cell pellets, nucleic acid preparation, protein sample preparation, and microtube processing.