What is the difference between a pneumatic and manual height adjustment on a drafting chair?

Pneumatic (gas lift) height adjustment lets you raise or lower the seat with one finger while seated by pressing or lifting a lever — the change is instant and smooth. Manual height adjustment uses a threaded screw or pin-and-hole mechanism that requires you to stand up, adjust the post to the desired height, and lock it in place. Manual adjustment is rare in modern drafting chairs and is mostly seen in very low-cost or industrial stools where pneumatic cylinders might not be appropriate. For any office or professional setting, pneumatic adjustment is vastly more convenient and is the standard. All of FindOfficeFurniture.com's drafting chairs use pneumatic cylinders — call 888-719-4960 for current selection.