A laboratory suction is a laboratory tool for liquid handling and transfer. It is usually made of plastic or glass, has a tip or flat head at one end, and can be used to draw, move, and discharge a solution or sample.

1. Accuracy: The laboratory suction head can accurately control the amount of suction and drainage, making the experimental results more accurate and reliable.

2. Convenience: The laboratory suction head is simple to operate, easy to use, and can quickly draw solution from one container and transfer it to another.

3. Hygiene: Laboratory suction heads are usually disposable, which can avoid the risk of cross-contamination and experimental failure.

Centrifugal tubes are widely used in biomedical research and clinical diagnosis, mainly for the following aspects:

1. Sample centrifugation: used to separate cells, proteins, nucleic acids and other samples, to facilitate subsequent analysis, measurement and experimental operations.

2. Disease diagnosis: Centrifugal tubes can be used for centrifugation of samples such as blood and urine for diagnosis and monitoring of diseases.

3. DNA/RNA extraction: Centrifuge tubes can be used in the centrifuge separation step of the DNA or RNA extraction process to help remove waste liquid and solid impurities.

4. Protein purification: Centrifugal tubes can be used for precipitation and concentration steps in the protein purification process to facilitate the separation and purification of proteins.

5. Storage freezing: Centrifugal tube can be used as a sample freezing container for the storage of cells, serum, enzymes and other samples, and its sealing performance helps to prevent contamination and water evaporation.