Which of the following is a measuring pipet?

• A. Mohr
• B. Ostwald-Folin
• C. Pasteur
• D. Volumetric

Answer: (A)

Measuring pipettes are graduated instruments with marks along their length that let you read and deliver varying volumes. The Mohr pipette fits this description best because it has calibration marks and is used to measure and dispense a chosen volume by aligning the liquid level with a mark. Pasteur pipettes have no marks and are just transfer tools, so they aren’t used to measure. A volumetric pipette is designed to deliver a single, exact volume and isn’t used for reading different measurements. The Ostwald-Folin pipette is specialized for certain conditions and is primarily a transfer/delivery tool for viscous fluids, not a general measuring pipette. Therefore, the Mohr pipette is the appropriate choice.