ISOLab Dispensers "Optifix" are the best choice providing precise and accurate bottle dispensing.

Easy Volume Setting - After loosening the locking screw the desired volume can eb set, then the locking screw is fixed. Precise adjustment screw can be used for fine calibration.
The graduations on the volume setting system are laser printed. Plastic coated glass cylinder is vacuum calibrated.
Valve block supplies complete tightness.
Stopper cap reduces contact with chemicals and prevents drying.