Reddit reviews ULAB Scientific Glass Erlenmeyer Flask Set, 5 Sizes 50ml 150ml 250ml 500ml 1000ml, 3.3 Boro with Printed Graduation, UEF1002
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5 Sizes 50ml 150ml 250ml 500ml 1000mlHigh quality 3.3 Borosilicate glass, Uniform wall thicknessExtra large marking spotTolerance is approximately +/- 5%ASTM Specification E960, Type I requirements
got it from amazon aprox 5 years ago(along with several other larger sizes) here's a pretty good listing for similar items for $16! seriously though.... so useful... everyone should have these around.