What is this Lab equipment? I want to know the name of this equipment with a sealed graduated tube and the purpose it's being used. 



I went through all the results of Google, but I was unable to find this exact equipment. I believe someone here should know this very well.
This lab equipment is called 'Fermentation Tube'. 



If you want to see how an experiment is carried out with this equipment, please watch the video below.

Mark Garcia: Lab Protocol - Fermentation in Yeast (Unit 9 Respiration); YouTube