While they're not that hard to build, the lab ones tend to be very heavy and not able to survive being carried around and dropped. The centrifuge they describe

While they're not that hard to build, the lab ones tend to be very heavy and not able to survive being carried around and dropped. The centrifuge they describe can be easily transported, is durable, and easy to fix. It's a great idea to be able to provide field medics with a tool like this in difficult environments where a lab grade device would be impractical.