Which instrument measures small volumes most accurately?

• A. Micropipette
• B. Graduated Cylinder
• C. Erlenmeyer Flask
• D. Water Bath

Answer: (A)

When you need to measure and transfer very small amounts of liquid, you use a tool built for precision at the microliter scale. A micropipette is designed to aspirate and dispense fixed, calibrated volumes with high accuracy, using a piston mechanism and disposable tips to minimize variability and contamination. Proper technique—pre-wetting the tip, reading the display at eye level, and releasing the plunger smoothly—further improves the accuracy of small-volume transfers. In comparison, a graduated cylinder is intended for larger volumes and relies on less precise graduations, making it far less accurate for tiny amounts. An Erlenmeyer flask is a general-purpose container with rough, not-to-scale volume markings, not a measurement instrument. A water bath is used for heating samples, not measuring volume.