Test Tube Icon - Science Lab Equipment Graphic #1858811 (License: Personal Use)

This vector-style illustration depicts a classic conical-bottom test tube with a thick black outline and transparent body, containing a gray liquid up to the third calibration line. The tube features four evenly spaced horizontal measurement marks, suggesting standard volumetric use in chemistry or biology labs. Its minimalist design ensures clarity and scalability across digital interfaces.

Commonly used on educational websites, science blogs, lab equipment catalogs, or infographics to represent experiments, chemical reactions, or diagnostic testing; matches user intent for visual explanations of lab procedures or scientific concepts.