Best Monitor Arms

Ergotron introduced the LX Pro as the successor to the long-running LX, and the mechanical substance is familiar: a constant-force gas spring with 13in of vertical travel, up to 25in of reach, 85 degrees of tilt, and a 10,000-cycle lift test behind a ten-year warranty. The Pro revision widens the useful bottom end — it starts at 4 lb rather than the LX’s 7 lb, so a light modern 24in panel actually balances instead of drifting upward. The trade is a slightly lower ceiling at 22 lb against the LX’s 25 lb. The practical improvements matter more day to day: enclosed cable routing, a tension-level indicator that makes setting spring force repeatable rather than guesswork, and a built-in rotation stop that keeps the arm from swinging into a wall. Motion is genuinely one-finger once tensioned.

• 4–22 lb capacity, displays to 34in
• VESA 75x75 and 100x100
• 13in lift, up to 25in extension
• Clamp for 0.4–2.4in desktops
• Needs 2.8in clearance beneath the desk
• 10-year warranty

The MT201 is the outlier on the spec sheet: 44 lb of capacity and a 17–49in size range at a price where most arms stop around 20 lb and 32in. MSI publishes usable numbers rather than vague claims — tilt from −20 to +50 degrees, swivel to 90 degrees either way, 180-degree pivot, roughly 20in of vertical travel and 21in of horizontal extension — and puts both a C-clamp for 10–80mm tops and a grommet base in the box, along with a quick-release VESA plate. Warranty is three years, short against Ergotron’s ten but longer than most arms under $100. The real constraint is the VESA pattern: it tops out at 100x100, so the large ultrawides its 49in rating implies frequently will not bolt on without an adapter. Read the 44 lb figure as headroom for a heavy 32in panel rather than a licence for a 49in one.

• 4.4–44 lb capacity, 17–49in
• VESA 75x75 and 100x100 only
• Tilt −20°/+50°, swivel ±90°, pivot ±180°
• C-clamp 10–80mm, grommet 10–35mm
• Quick-release VESA plate
• 3-year limited warranty

At this price the only question worth asking is whether corners were cut on the parts that fail, and the SS6 holds up better than most. It uses a real gas spring that HUANUO rates to 20,000 cycles, includes both a C-clamp and a grommet base rather than charging for one, and carries a five-year warranty — longer than VIVO’s three and far longer than the one year on Amazon’s own-brand arms. The clamp range is unusually generous at 0.59–3.54in, which covers thick desktops that defeat Ergotron’s 2.4in limit. Capacity is 19.8 lb across 13–32in, with about 15.75in of height travel, 180-degree swivel and full rotation for portrait mode. It is not as smooth or as rigid as an Ergotron, and setting the spring tension needs the supplied hex key rather than a thumb wheel. For a 15 lb 27in panel that mostly stays put, those are fair compromises.

• Up to 19.8 lb, displays 13–32in
• VESA 75x75 and 100x100
• Up to 15.75in height travel
• Clamp and grommet both included
• Desk thickness 0.59–3.54in
• Gas spring rated 20,000 cycles, 5-year warranty

This is the arm most large ultrawides actually need, and the reason is the VESA support as much as the capacity. The HX handles 75x75, 100x100, 200x100 and 200x200 natively, with an Ergotron adapter kit for larger patterns — so the 200x100 pattern that defeats every sub-$100 arm bolts straight on. Capacity is 20–42 lb across displays up to 49in, behind the same ten-year warranty as the rest of the line. The critical detail buyers miss is the minimum: the spring cannot be de-tensioned below 20 lb, so a 14 lb 27in panel will drift upward and refuse to hold position. This is the single most common HX buying mistake. Lift is 11.5in and extension 23.6in, both slightly shorter than the LX Pro — a fair trade for the load rating.

• 20–42 lb capacity — note the 20 lb minimum
• Displays to 49in
• VESA 75/100, 200x100 and 200x200
• 11.5in lift, 23.6in extension
• Clamp for 0.4–2.4in desktops
• 10-year warranty

A dual arm concentrates both displays’ weight and leverage on a single clamp, which is exactly where cheap dual mounts fail — first as creep, then as a slow forward lean you notice months later. The LX Pro Dual is built around that problem: a heavy two-piece clamp, a 5in pole with a side-by-side bracket, and ten years of warranty on the component most likely to give. Each arm handles 4–20 lb for 40 lb combined, with 13in of lift, up to 25in of reach, and independent pan and rotation so either screen can go portrait on its own. The tension indicator matters more here than on a single arm: two arms set to different spring forces produce screens that never quite line up. Buy the model number carefully — the side-by-side version is the one you want; the similarly named "direct" dual carries only 9.4 lb per monitor.

• 4–20 lb per monitor, 40 lb combined
• 27in maximum per arm
• VESA 75x75 and 100x100
• 13in lift, up to 25in extension
• Two-piece clamp, 5in pole, side-by-side bracket
• 10-year warranty

Under $100 the dual market divides into gas-spring arms and mechanical tension-screw stands, and the difference shows up daily. The DS6 uses gas springs rated to 20,000 cycles, so a height change takes one hand; the similarly priced VIVO stands use mechanical counterbalance springs that need retensioning whenever the monitors change. The DS6 handles 4.4–19.8 lb per arm across 13–32in with about 15.75in of height range, 180-degree swivel and full rotation, and ships with both C-clamp and grommet bases. The five-year warranty is unusually long here. Be realistic about the ceiling, though: two 32in monitors near 19 lb each put close to 40 lb on one clamp, and this is not the arm for that. For two 24–27in panels in the 10–15 lb range, which describes most desks, it is a sound purchase.

• 4.4–19.8 lb per arm, displays 13–32in
• VESA 75x75 and 100x100
• Up to 15.75in height range
• Tilt +85°/−50°, swivel 180°, rotation 360°
• Clamp and grommet both included
• Gas springs rated 20,000 cycles, 5-year warranty