Which instrument is commonly called a graduated pipette?

• A. Transfer Pipet
• B. Serological Pipette
• C. Test Tube Brush
• D. Swab

Answer: (B)

Measuring exact volumes relies on a instrument with calibrated marks. A graduated pipette has markings along its length and is designed to deliver the precise volume indicated by those marks; the graduations extend to the tip so you can read the volume and dispense exactly that amount. That's why it's commonly called a graduated pipette. A transfer pipet typically has no markings and is used for moving liquids rather than measuring; a test tube brush is for cleaning tubes, and a swab is for collecting samples, not for measuring volumes.