Brown Liquid Sample in Graduated Test Tube - Lab Science Illustration #38066 (License: Personal Use)

This vector illustration depicts a clear plastic conical-bottom test tube with a vibrant blue screw cap and evenly spaced gray volume markings. The tube contains a translucent brown liquid filled precisely to the 5 mL graduation line, suggesting a controlled experimental or diagnostic sample. A subtle highlight on the tube wall adds realism and depth to the otherwise clean, schematic style.

Used in science education websites, lab equipment catalogs, medical diagnostics pages, or research methodology guides; supports user intent to visualize sample handling, titration, or assay preparation.