The longest reach and the most rise of the clamp mounts here
The longest reach and the greatest height range of the clamp mounts on this shelf — 21.25 in and 18.1 in — on a gas-spring arm stated to have passed 20,000 durability cycles.
Acer gas-spring dual arm with 21.25 in reach
Best for: A deep desk and a tall person, where reach and rise are the binding constraints.
Two numbers put this arm at the top of the shelf: 21.25 in of reach and 18.1 in of height adjustment, both the longest published among the clamp mounts here — the MOUNTUP, next best, gives 19.5 and 16.9 in. Reach decides whether a 32 in screen can be pushed back out of your face and pulled forward when needed; rise decides whether the top of the panel gets to eye level at all. Five of the ten mounts on this shelf publish neither figure.
The mechanism is a gas-assisted lift with a tension screw — more tension for heavier screens, less for lighter ones — and a stated 20,000 durability cycles, which the listing contrasts with “ordinary hinge stands”. Each arm takes 17 to 32 in screens of 4.4 to 19.8 lb on a VESA 75 or 100 mm pattern. The movement range is tilt 90° up and 60° down, swivel ±90° and 360° rotation, and the listing names four layouts it supports. Both fixings are specified — a clamp for tops between 0.59 and 3.15 in, or a grommet needing a hole over 10 mm (0.39 in) — and Acer rules out glass and plastic desktops.
One thing about the page itself is worth flagging, because it affects anyone reading it with assistive software: several of its notes and dimensions are typeset in mathematical bold Unicode characters rather than ordinary letters and digits. They look like emphasis on screen and read as gibberish to a screen reader, and the figures inside them — the clamp range and the height and reach among them — are the ones a buyer most needs. At about $70 it costs the same as the two HUANUO arms, for the most travel on the shelf.
Read on the day this page was built: $70 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Best for: A deep desk and a tall person, where reach and rise are the binding constraints.
Prices quoted in this text were read on 2026-10-13. The live price is at the top of the page.
It is the figure that decides whether the top of the screen reaches your eyes when you sit upright. At 18.1 in of travel it is the most on this shelf, ahead of 16.9 in on the MOUNTUP and 16.2 and 15.75 in on the two HUANUO arms, and that extra inch or two is what accommodates a tall person at a standing desk. Reach, at 21.25 in against the MOUNTUP's 19.5 in, is also the longest here.
Dual horizontal — the two screens side by side; horizontal and vertical — one landscape, one in portrait; dual vertical — both in portrait; and a fourth Acer calls "cross horizontal", which it does not illustrate in words. The listing enumerates the options rather than implying them.
Acer gives a C-clamp for tops 0.59 to 3.15 in thick (15 to 80 mm) or a grommet needing a hole over 10 mm, and states it is not suitable for glass or plastic surfaces. It also asks you to check the depth of your desk before buying — at 21.25 in of reach, a shallow desk leaves the screens hanging over the edge or the arms folded back.
The same dual C-clamp base and the same per-arm rating as its stablemate, with more rise — 16.2 in — a 27 in screen ceiling, and no manufacturer reference anywhere on the listing.
Best for: Two 24 or 27 in screens on a wooden desk, where a two-clamp base matters more than the last inch of rise.
A dual mount for flat or curved screens up to 35 in and 22 lb (10 kg) each — the largest screen size on this shelf — with stepless, tool-free spring adjustment and a target-weight indicator.
Best for: Two large or curved screens up to 35 in, on a desk shared between people who reposition them often.
A dual monitor mount whose base uses two C-clamps instead of one, with a listing that states its three monitor conditions and its three desk conditions before anything else.
Best for: A solid wooden desk, where the clamp itself is the thing you are worried about.
A tailored linen dust cover sized for 20 to 22-inch monitors, protecting against dust, fingerprints, UV exposure and splashes, with a rear cable opening.
Best for: A 20 to 22 in monitor left unused for stretches — evenings, weekends, holidays — in a dusty or sunlit room.
A rotating spring-clamp hanger whose listing matches the Celerion hook point for point, and which reaches further down the thickness range — 0.31 in, about 8 mm, at the thin end.
Best for: A thin desktop or a glass top, where 8 mm (0.31 in) is the figure that decides it.
A spring-clamp hook that rotates 360 degrees so the headset can be turned out of the way under the desk, with a cable rack on the side and a stated clamp range of 0.47 to 1.57 in.
Best for: A desk of ordinary thickness where the headset should disappear under the edge between sessions.