... , the operation use is simple, through the syringe pressure, the drop rubber time, the pinhole size, flows backwards the vacuum to ... of factors after moving settled, after foot switch triggering will drop out the equal quantity colloid (difference not to surpass .1%).7 ... 10.7 MPa;4. repeat accuracy: 0.5%;5. smallest drop out point quantity: 0.005ml;6. working speed: >300/minute;7 ...