double neck bottle is interesting functional liquid packaging

double neck bottle is interesting functional liquid packaging
The common liquid bottle only has one neck,today i will introduce a strange bottle which has two neck.Why it has two neck?
This double neck bottle has twin neck because of the function of this bottle.The twin neck bottle can measure liquid volume which you want to get.
This double neck bottle is designed by siphon principle.Siphon can be described as a tube or pipe that allows liquid to flow from the higher level to the lower level.This double neck bottle has two chambers,one is bigger,the other one is small,in generally,the bigger chamber is filled liquid,the small chamber is empty,but the small one has scale line.So when you need given volume liquid,you can press the bigger chamber,then the small chamber can be filled liquid.
So if you need given volume liquid,I suggest that you can choose this double neck bottle.