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LABORATORY TOOLS: Cryogenic test tube is suitable for all kinds of frozen experiment, can be used to hold solid liquids and powders, which is a little helper of the experiment, easy to operate and convenient to use. DURABLE MATERIAL: Plastic test tube is made of premium plastic, high temperature and low temperature resistant, can be frozen for a long time. Good sealing, no leakage and evaporation. PRECISE SCALE: Frozen test tubes with clear scales ensure accurate measurement results and easy to read liquid volume. Good transparency makes it easy to distinguish and observe internal liquids. WIDE APPLICATION: Plastic sample tube is suitable for samples, essential oils, perfumes, dyes, etc. Can be used in hospitals, epidemic prevention, schools, research laboratories, etc. VALUE PACKAGE: Comes with 50 pieces cryogenic test tubes in blue and orange, each color for 25 pieces, the capacity is 5 ml.