Yaheetech appears once on this site, in ergonomic office chairs, with its mesh office chair.
A named test report. Yaheetech cites SGS report SDHL241202405001FT: its gas spring passed 100,000 impact cycles and 120,000 durability cycles, and the backrest, armrests and seat are stated to meet BIFMA component requirements. It names no BIFMA test such as X5.1 for the whole chair, which the CAPOT does — what BIFMA certification tests explains the difference.
Check the seat height first. It adjusts from 35 to 45 cm (13.8 to 17.7 in) — the lowest range in the hub: its top position is still below the CAPOT’s lowest, 47 cm. That suits a low desk or a shorter person better than a standard 74 cm (29 in) desk and a tall one. Setting up a new office chair shows how to check it against your desk.
Where the price shows. The lumbar support is the curve of the mesh backrest rather than a separate adjustable pad, as on the CAPOT and Marsail, and the armrests are fixed. The backrest rocks, with its angle set between 90° and 120° by a knob under the seat. No weight capacity and no warranty are published.
The price. About €46 on amazon.de when we checked — the lowest in the hub, against about €80 for the Marsail and €180 to €200 for the ELITESEATS and CAPOT. It is not listed on Amazon.com, so from the US the button opens a search.