Coulter Counter Model FN

This used Coulter Counter Model FN is an early generation electronic particle counter from the historic Coulter Counter line, built to count and size particles in a fluid stream using impedance based detection. It provided laboratories with one of the first practical automated alternatives to manual hemocytometer counting, delivering faster and more consistent particle and cell counts. This unit is being sold in used condition and reflects the foundational technology behind decades of subsequent Coulter hematology instruments. The Model FN operates on the same core Coulter principle found in later systems, sensing changes in electrical resistance as particles pass through a small orifice, which allows it to generate accurate counts across a range of particle sizes. Its analog construction and mechanical simplicity have made many of these units surprisingly long lived, and they remain of interest to laboratories with legacy protocols as well as to collectors and educators who want to demonstrate the origins of modern automated hematology. It is not a multi parameter CBC analyzer but a dedicated counting instrument. This model appeals to teaching laboratories, instrument collectors, and research settings where a working example of early Coulter counting technology is useful for demonstration or specialized low throughput counting tasks. It is best suited to buyers who understand its vintage nature and want a functional piece of hematology counting history rather than a full featured modern replacement for routine clinical CBC work.