Volumetric flasks with glass stoppers are a crucial piece of equipment for precise measurement in any scientific setting. Made from high-quality borosilicate glass and Class B , these flasks are durable and provide exceptional chemical resistance. The ground glass stopper ensures a secure and airtight seal, while the marking spot allows for easy identification of the correct fill line. Available in 100ml and 250ml sizes, these flasks are suitable for a variety of laboratory applications.