Test Tube black outline icon
Outline test tube with rimmed top, liquid level line and bubbles inside
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About the Test Tube black outline icon
This icon shows a narrow test tube with a flared rim at the top, a rounded base and a wavy liquid line about a third down, with several round bubbles floating inside the sample. It reads instantly as chemistry, laboratory testing and scientific measurement. Use it for lab result dashboards, clinical testing pages, pharmacology and biology course material, science app navigation, or research report slides.
Composition is tall and vertical: the straight walls give it a strong stem shape, while the varied bubble sizes keep the interior from looking empty and signal an active reaction. It pairs naturally with beaker, microscope and flask icons from the same set. At small sizes the smallest bubble can disappear, so use it at 24px or larger.
This is the black outline version of the test tube icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
Get it free as an SVG vector or transparent PNG (16-512px), copy the SVG code, or restyle it in the free online editor — recolor any part, add gold, neon or gradient effects, animate it, or export EPS, PDF and DXF.
Free for personal and commercial use with attribution.
