Canadian Society for Medical Laboratory Science (CSMLS) Practice Exam

Where should a volumetric pipette be viewed to ensure accurate measurement?

1. Above eye level

2. Below eye level

3. At an angle

4. At eye level

The correct answer is: At eye level

Viewing a volumetric pipette at eye level is essential for ensuring accurate measurement because it allows for a direct line of sight to the meniscus, which is the curved surface of the liquid in the pipette. When the eye is aligned with the meniscus, it helps eliminate parallax errors—distortions in measurement that occur when the scale is viewed from an angle rather than straight on. This alignment ensures that the liquid reaches the desired calibration mark accurately. Proper technique in reading the meniscus at eye level is crucial for achieving precise and reproducible volumetric measurements in laboratory settings.