... , the piston in the piston sleeve moving at a fixed range (adjustable), to generate negative pressure, ... 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 ... the vessel wall, then slowly release the button, that is a complete operation process. 10-50ul Pipettor Pipette Micropipettor ...