The product has a simple analysis structure, convenient operation, and is easy to use for beginners The measurement range is wide, and the fine-tuning range can be from 0.1μl-10ml. Each model is marked with a different range, and the range can be fine-tuned The experiment of no residual liquid discharge is safer. The precision pipette has accurate liquid aspiration and a blow-out function. There is no residual liquid in the tip after discharge The capacity protection lock locks the range. The series has a range lock key, which locks the range with one button to prevent the range from changing during operation The details are more ingenious, and the fine-tuning structure rotates comfortably, which is flexible and convenient