While it is possible to construct a crude flow cytometer using inexpensive materials such as a cell phone and a laser pointer, the accuracy and precision of such a device would be very limited compared to a commercial flow cytometer. Commercial flow cytometers are complex instruments that incorporate advanced optics, electronics, and software to accurately measure and analyze the physical and chemical characteristics of cells. They are calibrated and validated to provide reliable and reproducible results.

Building a DIY flow cytometer from scratch requires specialized knowledge in optics, electronics, and fluidics, and it is unlikely to achieve the same level of performance as a commercial instrument. For accurate and reliable flow cytometry measurements, it is generally recommended to use a commercial flow cytometer or work with a laboratory that has access to one.