... , enzyme, and fungi, etc in aerobic and anaerobic cultures. This series of products suits for various kinds of microbiology lab, pilot ... sight glass.Surface finishInternal surface is 0.28-0.6μm by mechanical polishing, (passivation or electro-polish are optional) ... manual valve (standard system)2.Automatically adjusting with mass-flow meter and pneumatic valves (optional)3.Air in filter , tail gas ...