what is a test tube rack used for

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  Laboratory Instruments

  Laboratory Test Tube Rack 12 Hole

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  $ 35 Original price was: $ 35.$ 20Current price is: $ 20. Add to cart
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  Laboratory Instruments

  Stainless Steel Test Tube Rack with 18 Holes: A Reliable Laboratory Essential

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  $ 50 Original price was: $ 50.$ 25Current price is: $ 25. Add to cart
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