Using its auto-focus technology and cell counting algorithm, the TC20 automated cell counter counts mammalian cells in one simple step. Produce accurate cell counts in less than 30 seconds, the unit is compatible with a broad range of cell sizes and types. It stores up to 100 counts in the onboard memory for access any time, or it can be hooked up to a PC with the optional TC20 data analyzer software to further analyze exported cell images. Using microscopy with auto-focus that analyzes multiple focal planes to identify the best plane this system does not requiring any user input. The auto-focus leads to highly reproducible cell counts with reduced user-to-user variability compared to a hemocytometer and cell counters with manual focus.