... the piston in the piston sleeve moving at a fixed range(adjustable), to generate negative pressure, suck ... rotates gently, so as to ensure the sealing is well.2. Before using, please suck in or ... the button,waiting for 1-2 seconds, after that, take it out from the liquid, and do ... slowly release the button, that is acomplete operation process.Attentions:1. The pipette is belong to precise measure, do ...