Test Tube Icon - Science Lab Equipment Illustration #3894490 (License: Personal Use)

This is a simplified, high-contrast vector illustration of a laboratory test tube. The tube features bold black outlines, a rounded bottom, and four horizontal measurement marks along its side. It is half-filled with vibrant red liquid, suggesting a chemical reagent, blood sample, or indicator solution.

Used in educational websites, science blogs, medical infographics, and UI elements for apps related to chemistry, biology, or healthcare diagnostics; matches user intent for visual metaphors of testing, analysis, or experimentation.