Non-wetting, they deliver all they contain (calibrated TC/TD at 20°C). Meet Class B accuracy requirements of ASTM E1272 "Cylinder, Graduated, Laboratory, Glass" and all requirements of ISO Standard 6706 "Plastic Laboratory Ware-Graduated Measuring Cylinders". No meniscus to confuse readings. Blue, molded, PP base resists tipping. Molded-in graduations with additional major graduation lines on the back of cylinder for easier, more accurate fluid level readings. Generous pour spout. Can be autoclaved, but accuracy will be affected.