Machine-blown Class A flasks to have sealed heavy-beaded, heavy-tubing tooled necks with large white block letters. Graduation line is sharp and permanent. The 1 and 2 ml sizes are test tube shaped. The 10 through 2000 ml sizes are supplied with snap-caps.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.