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PYREX* Brand Test Tubes, Reusable, Borosilicate Glass
Made from special machine-made tubing of correct wall weight. Tubes are well annealed, resistant to heat and chemically stable. Rims are fire polished. Particularly suited for use in bacteriological work. Repeated sterilization, wet or dry, does not cause clouding.
With beaded rim and permanent white marking spot. The 25mm tubes (60815-228 and -240) do not have a marking spot.
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