For labs, classrooms, or serious home science, this Eisco 2000mL volumetric flask is top-notch. It's Class A borosilicate glass (the good stuff), so it can handle high heat, thermal shock, and even autoclaving. The single graduation mark is precise with a tolerance of ±0.600mL. A cool feature is the QR code printed on the flask—scan it to pull up the calibration certificate instantly. The reinforced rim adds durability, and the included polyethylene stopper (NS29/32 size) seals securely and resists chemicals. The flask is about 6.25\ in diameter and 14.75\ tall. Whether you're preparing standard solutions, doing dilutions, or teaching chemistry, this flask is accurate, durable, and professional-grade.