The extended tip is made of medical grade polypropylene material, manufactured in a clean environment, precision mold, professional production process, to ensure that the tip has a smooth inner surface and the same size. Because of its length, it can be directly inserted into the bottom of the tube to aspirate, and there is no need to tilt it. After inserting into the bottom of the tube, it does not touch the wall of the tube, thus avoiding cross-contamination. As long as the tip can be installed, it is the tip that can be used" - this is the general understanding of almost all users about the adaptability of tips. Xiaobian can say that this statement is partly true but not completely true. The extension tip on the liquid dispenser can indeed form a pipetting system with the pipette to realize the pipetting function, but is this reliable? In fact, when answering this question, we need to use actual data to speak.

1. You may wish to test the performance after matching the pipette with the tip. After rinsing the tip, perform several repeated additions, weigh each addition, and record the reading.

2. Calculate the accuracy of the pipetting operation after converting the density of the test liquid into volume.

So what should a good suction head have at least? A good tip depends on concentricity, taper, and the most important point is adsorption;

1. Let’s talk about the taper first: if it is better, the match with the gun is very good;

2. Concentricity: Concentricity is whether the circle at the suction nozzle of the tip and the connection between the tip and the pipette appear to be the same center of the circle. If it is not the same center, it means that the concentricity is not good;

3. Adsorption: The adsorption is related to the material of the tip. If the material of the tip is not good, it will affect the accuracy of pipetting, resulting in a large amount of liquid remaining or simply hanging on the wall, resulting in pipetting errors. Therefore, everyone should pay special attention to the above three points when choosing an extended tip!