Graduated Test Tube Illustration - Lab Equipment Diagram #286179 (License: Personal Use)

This black-and-white vector-style illustration shows a classic cylindrical test tube with a rounded bottom and a series of evenly spaced horizontal graduation lines along its side, indicating volume measurements. The design emphasizes clarity and functionality, making it suitable for textbooks, lab manuals, or digital learning platforms. No liquid or background is included, ensuring focus on the instrument’s structure.

Commonly used in educational websites, science curricula, chemistry lab guides, and medical training materials to visually represent basic lab equipment. Matches user intent for understanding or identifying standard test tubes in academic or professional contexts.