Sigma Scientific Glass Pvt. Ltd offers Stirrer Systems. Sigma Scientific Glass Pvt. Ltd is an ISO 9001:2000 certified company. Stirrer Systems are used in chemical, pharmaceutical, dyes and allied industries. They are available in a wide variety to use glass vessels as agitated reaction system. They generally comprise of two components: agitator and a drive unit including chuck and seal. A reducer or vessel cover is also required to connect the top neck of the vessel to drive unit.