Corning 9530-2 Pyrex Capillary Melting Point Tube, Both Ends Open, 0.8 mm-1.1 mm ID, 0.25 mm Wall Range (Pack of 100): Amazon.com: Industrial & Scientific
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Corning Pyrex Borosilicate Glass Thiele Melting Point Tubes, 25mm Outer Diameter, 150mm Length (Case of 12): Science Lab Tubes: Amazon.com: Tools & Home Improvement