Suction head -- also known as gun head, pipette nozzle, belongs to the disposable consumable, used in any molecular biology and genetic research applications, the effective formation of a protective structure between the pipette and the sample, to ensure the safety of sampling and sampling. Capacity range from 10-5000ul. Generally divided into: sterilization and non-sterilization two. However, according to the application scenario, they can be divided into: 1. Conventional suction head 2. Filter element suction head 3. Automatic suction head 5. Box folding suction head (no filter element only) 6. Box combination suction head

Good suction to look at concentricity, taper, and the most important point is adsorption;

1. First of all, let's talk about the taper: if it is good, the match with the gun will be very good, and the suction will be more accurate;

2. Concentricity: concentricity is the suction nozzle of the suction head and the vertical circle of the link between the suction head and the pipette seems to be the same center of the circle, if not the same center of the circle that the concentricity is not good;

3. Finally, one of the most important is our adsorption: adsorption and the material of the suction head, if the material of the suction head is not good, it will affect the accuracy of pipette, resulting in a large number of liquid retention or referred to as hanging wall, resulting in pipette error;