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test tube rack
Test tube racks are used in chemistry laboratories to store test tubes, either dry or containing some chemicals (waiting for further operations). Since a test tube has a rounded bottom, it cannot stand by itself and thus the rack is a convenient and necessary piece of laboratory equipment for storage of test tubes.
1. To hold test tubes upright to keep them from spilling.2. 36cells style, smaller than Diameter17mm's tube can use.
test tube rack
