How to adjust the height of the European bar chair lift chair and high stool

There are two types of air pressure lifting and mechanical lifting.

The air pressure rise and fall is the most common nowadays. For example, in a bar, it is raised and lowered by a paddle that can be reached under the seat. Most of them are pressed and sat on a stool. Going up means lowering, standing up means raising. There is also a type used in barber shops, which requires people to repeatedly step on the control lever at the back.