Which lab item is used to accurately measure liquid reagents?

• A. Beaker
• B. Pipette
• C. Flask
• D. Graduated Cylinder

Answer: (D)

Measuring liquid volume accurately relies on an instrument that has clear, evenly spaced markings for reading the amount directly. The graduated cylinder is designed for this purpose. Its graduations run along the side, allowing you to read the exact volume by looking at the bottom of the liquid’s meniscus at eye level. The tall, narrow shape helps reduce parallax error and provides a more precise reading than a beaker or a flask, which are primarily for mixing or containment and have fewer precise markings. A pipette is great for delivering a specific volume, but for directly measuring an unknown or variable volume with accuracy, the graduated cylinder is the best tool.