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Volumetric Flask, 20ml - Class A - 10/19 Polyethylene Stopper, Borosilicate Glass - Blue Graduation, Tolerance ±0.040 - Eisco Labs: Amazon.com: Industrial & Scientific
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Volumetric Flask, 20ml - Class A Tolerance ±0.04ml - Beaded Rim - Single White Graduation, Blue Printed Specifications - Borosilicate 3.3 Glass - Eisco Labs: Amazon.com: Industrial & Scientific
![Volumetric Flask, 20ml - Class A - 10/19 Polyethylene Stopper, Borosilicate Glass - Blue Graduation, Tolerance ±0.040 - Eisco Labs: Amazon.com: Industrial & Scientific Volumetric Flask, 20ml - Class A - 10/19 Polyethylene Stopper, Borosilicate Glass - Blue Graduation, Tolerance ±0.040 - Eisco Labs: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/51Q3ZeK7CwL._AC_UF1000,1000_QL80_.jpg)