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  1. Test tube - Wikipedia

  2. Amazon.com: Test Lab Tubes - Test Lab Tubes / Lab Tubes: …

  3. Test Tube: Types Uses, and Importance • Microbe Online

  4. Test Tube: Working, Types, and Uses - Master Chemistry

  5. Test Tubes | Fisher Scientific

  6. Test Tube | Definition, Purpose & Uses - Lesson | Study.com

  7. Test Tubes, Vials, Caps and Closures - Fisher Sci

  8. Amazon.com: Test Tubes

  9. Lab Glass Test Tubes | Small to Extra-Large Test Tubes Sizes

  10. Test Tubes: Types, Use, Disadvantages - Science Info