Empty Test Tube Illustration - Lab Equipment Clipart #1858801 (License: Personal Use)

This black-and-white line illustration depicts a standard cylindrical glass test tube with a slightly rounded bottom and open rim, rendered in clean vector style. The design emphasizes clarity and neutrality, making it suitable for textbooks, lab manuals, infographics, or digital interfaces where symbolic representation of chemical or biological testing is needed.

Used in science education websites, laboratory supply catalogs, medical blogs, and instructional materials to represent experimental procedures, sample collection, or generic lab equipment. Matches user intent for clipart, icons, or schematic diagrams requiring a universally recognizable test tube symbol.