HUANUO appears four times on this site: a single monitor arm and a bamboo footrest among the reviews, and two dual mounts, the HNDS6 FlowLift and a 13–27 in dual mount.
The single arm. The FlowLift Pro is the only arm in the monitor arms hub to state a purely mechanical spring, with no gas; HUANUO says it measured no force loss after 50,000 cycles, with TÜV-tested mechanics. It takes 13 to 32 in screens of 2 to 9 kg (4.4 to 19.8 lb), clamps desks 15 to 90 mm thick — the widest range in the hub — and has a window showing when the spring tension is right and a VESA plate that clips on without tools. No warranty length is given.
Check the arm’s seller. It read about $50 on Amazon.com when we checked, but about €20 on amazon.de and £20 on amazon.co.uk — a gap that usually means a different seller on the US store.
The two dual mounts. Both use two C-clamps on a wide base (or a grommet), hold 2 to 9 kg (4.4 to 19.8 lb) per arm on desks 15 to 90 mm thick, and read about $70. The HNDS6 takes 13 to 32 in screens with up to 40 cm (15.75 in) of height adjustment; the other stops at 27 in with 41 cm (16.2 in). Both listings state their limits up front: wooden desks only, no glass or plastic, and nothing under the edge where the clamps go.
The footrest. Bamboo with a pebble texture, stated waterproof and easy to clean, with four heights from 7.9 to 17.1 cm (3.1 to 6.7 in) — the widest range in the footrests hub — and a tilt set from 0° to 24°. It is firmer underfoot than a padded rest. About $30 when we checked.
