A good suction head depends on concentricity, taper and, most importantly, adsorptivity;

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

2. Concentricity: concentricity refers to whether the circle perpendicular to the suction nozzle of the suction head and the connection between the suction head and the pipette is the same center. If it is not the same center, it means that the concentricity is not good;

3. Finally, the most important one is our adsorptivity: the adsorptivity is related to the material of the suction head. If the material of the suction head is not good, it will affect the accuracy of liquid transfer, resulting in a large amount of liquid retention or wall hanging, resulting in liquid transfer error;

Therefore, you should pay special attention to the above three points when selecting the suction head

A row of bad suction heads will have different spacing! You will see obvious