Test Tube Illustration - Scientific Lab Equipment Icon #1858804 (License: Personal Use)

This minimalist black-and-white illustration depicts a cylindrical laboratory test tube with a rounded bottom and four evenly spaced horizontal graduation marks along its side. The design emphasizes clarity and recognizability, making it suitable for scientific diagrams, educational materials, or UI icons. Its clean vector style ensures scalability without loss of detail.

Used in educational websites, science blogs, lab equipment catalogs, and health/STEM-related landing pages where visual representation of basic lab tools is needed. Matches user intent for finding royalty-free, simple scientific illustrations.