Glass Pipets Laboratory Operations Review 32
PIPET DESCRIPTION/USE
Volumetric
Ostwald-Folin
Serological
Mohr
Micropipet
Transfer pipet. Single calibration mark. Calibrated to accurately deliver fixed volume of nonviscous samples &
standards. Touch off last drop against wall of receiving vessel.
Transfer pipet. Similar to volumetric pipet, but bulb closer to tip. Etched ring means blowout. Used for accurate
measurement of viscous fluids, e.g., whole blood. Not widely used.
Graduated or measuring pipet. Graduation marks down to tip. Etched ring means blowout. Can use for serial
dilutions & measuring reagents. Not accurate enough for measuring samples or standards.
Graduated or measuring pipet. Doesn’t have graduation marks all the way to tip or frosted band near upper end.
Delivery is made “point to point.” Not widely used.
Disposable pipet for volumes ranging from 1–1,000 mL. Single calibration mark. Filled by capillary action.
TC. Must be rinsed out with diluent to deliver exact amount. Small pipetting bulb is used.
