1. Select the right suction head: Select the right suction head according to the specifications and experimental requirements of the pipette gun. In general, the capacity of the suction head should match the range of the pipette gun to ensure the accuracy of the pipette.

2. Check the quality of the suction head: Before installing the suction head, check whether the suction head is damaged, deformed or contaminated. If found, should promptly replace the new suction head.

3. Install the pipette: Insert the pipette vertically into the pipette and ensure that the pipette is tightly connected to the pipette. Gently rotate the transfer gun to ensure that the suction head fits the pipette without air leakage.

Note on the use of pipette nozzle

1. Keep the pipette vertical: When using the pipette, always keep the pipette vertical and avoid tilting or shaking to ensure the accuracy of the pipette.

2. Slowly absorb liquid: When absorbing liquid, the button of the pipette gun should be slowly pressed to avoid splashing liquid or inhaling air due to rapid operation.

3. Avoid cross contamination: When absorbing different liquids, the suction head should be replaced in time to avoid cross contamination. At the same time, the pipette and suction head should be cleaned and disinfected regularly to ensure the accuracy and safety of the experiment.