Centrifuge tubes with conical bottoms and graduation markings are laboratory glassware used for separating solid and liquid components in a sample. The conical bottom allows for the efficient separation of the components by centrifugation, while the graduation markings provide precise measurements of the volume of the contents.

The tubes are typically made of durable, chemically-resistant plastic or glass, and have a screw cap for a secure and airtight seal. The screw cap helps prevent leaks and spills, and also allows for easy dispensing of the contents.

Centrifuge tubes are commonly used in medical and biological research, as well as in chemical and industrial analysis. They come in various sizes and capacities and can be used for a wide range of applications, such as separating blood components, purifying samples, or analyzing mixtures.