Review on Borosilicate Glass Graduated Cylinder by Karter Scientific 213I12 by Paul Williams

At the time of purchase (11th November 2014) this item was listed as a 'Class A Graduated Cylinder' in both the 'Product Specifications' and 'Product Description'. The item I received from seller "Lake Charles Manufacturing" is clearly a Grade B, which is NOT a slight inconsistency for laboratory glassware. One can only hope that it is actually made from borosilicate (pyrex) as advertised. Whether grade A or B, ASTM E1272 - 02 (2012) allows for a "minimum" 0.2 graduation on a 10mL cylinder with a gap of less than 1mL, which this article demonstrates. Neat manufacturing process with no obvious burrs, chips or deformed surfaces in functional areas. Final grades seem to be the kind that stand up to a lot of punishment. The sample I received met exactly Class B specifications (+/- 0.2ml) when measured on a scale (dial) with distilled water at 20°C in 1ml increments up to the 10- ml mark was measured. To the naked eye, the deviation from zero was the same in magnitude and direction across the range, which is good. I was pleasantly surprised by the results, although I'll stop here as several other reviewers have expressed dissatisfaction with their results in this regard (meaning "your mileage may vary"). The dimensions were measured at three points with a digital caliper and averaged: cylinder outer diameter (OD) 16 mm. The inner diameter of the cylinder (internal diameter) is 12 mm. The thickness of the cylinder wall is 2 mm. Overall Height (including (3) extruded glass bosses/legs on base) 153mm. The top/rim of the cylinder is slightly extruded; The thickness is 2.15mm. The spout extends 1.5mm, resulting in an outside diameter of 17.5mm at this point.