Chemistry - What is this Lab equipment?
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
The piece is a type of eudiometer also called a gas measuring tube. The graduations are for measuring gas collected and the bulb is used to hold liquid to assist in filling the tube with liquid.