Test Tube Icon

Free Test Tube icon for manufacturing documents. Transparent PNG, commercial use OK, no sign-up.

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Category: Measurement & Inspection · Updated 2026-10-03

About the Test Tube

A test tube is a small glass or plastic cylinder closed at one end, used to hold and mix samples. Laboratories in chemical, food and pharmaceutical plants use it for sample preparation and quality checks.

Where to use this icon

• Laboratory test procedures
• Quality inspection flow diagrams
• Training slides for lab staff

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