This Ergotron LX review is the easiest verdict we have written all year: if you want one monitor arm that you will never have to think about again, this is the one to buy. We have clamped, unclamped, re-clamped and re-loaded ours more times than is reasonable while testing other arms against it, and it keeps winning. At around £150–£180 it is not the cheapest arm in the UK, but it is the one that earns the description “the gold standard” without irony.
We have used the LX for six months holding a 6.5 kg 27-inch 4K panel, swinging it between a sitting and a leaning-in position dozens of times a day, and it has not drifted, sagged or loosened once. Below is the full breakdown: what you get, how it fits, how it lives on the desk, and whether it is worth paying four or five times the price of a budget arm.
Ergotron LX at a glance
| Spec | Ergotron LX |
| Type | Single, gas-spring (Constant Force) |
| Weight range | 3.2–11.3 kg |
| Max monitor size | Up to ~34 inches |
| VESA support | 75×75 and 100×100 mm |
| Range of motion | 33 cm height, 64 cm reach, 360° rotation, tilt/pan |
| Mounting | C-clamp (10–60 mm) and grommet, both included |
| Material | Die-cast aluminium |
| Warranty | 10 years |
| UK price | around £150–£180 |
Build and design: aluminium that feels like it will outlast the monitor
The first thing you notice unboxing the LX is the weight. This is solid die-cast aluminium, not the hollow steel-and-plastic of budget arms. The polished finish (it also comes in white, black and a tall pole variant) looks at home on any desk and resists the scuffs that cheaper painted arms pick up. There is no flex anywhere in the structure, which is exactly what you want when a 7 kg screen is hanging off the end of a 64 cm reach.
The heart of the arm is Ergotron’s Constant Force gas spring. Unlike a basic gas strut, it is engineered to apply the same lifting force across its whole travel, which is why the screen stays put wherever you leave it rather than slowly creeping up or down. After six months ours holds position as precisely as the day we fitted it.
Fitting the Ergotron LX
Installation took us about fifteen minutes with the supplied Allen key, and the instructions are clear pictograms rather than a wall of text. You choose between the C-clamp, which grips desk edges from 10 to 60 mm thick, or the grommet mount if you want to drill through. We used the clamp on a 25 mm IKEA worktop with no flex at all.
- Assemble the base clamp and slot in the upright pole.
- Attach the two-part arm to the pole and route the monitor cable through the built-in channels.
- Snap the VESA plate onto the back of your monitor, then hook the monitor onto the arm.
- Set the spring tension with the Allen key to match your monitor’s weight — a couple of turns is usually enough.
The only fiddly step is tensioning the spring for very light or very heavy monitors, but the supplied guide gives a clear starting point and it is a one-time job. Cable management is genuinely good: clips run the length of the arm so the cable stays hidden as the screen moves.
Living with it: six months of daily use
This is where the LX justifies its price. Repositioning the screen really is a one-finger operation — pull it toward you to read fine print, push it back to free up desk space, swing it 90° to show a colleague, and it glides without resistance and stops dead where you let go. Cheaper arms either fight you or fail to hold the new position; the LX does neither.
Over six months it has needed zero maintenance. No re-tightening, no drift, no sag on the 6.5 kg panel. The 33 cm of height travel comfortably covers the gap between a seated eyeline and a standing one if you pair it with a sit-stand desk, and the full tilt range lets you angle the screen down slightly to cut overhead glare — a small thing that makes a real difference over a working day.
Compatibility: will it fit your monitor?
The LX handles monitors from 3.2 kg to 11.3 kg, which covers almost every 24-inch and 27-inch panel and most 32-inch ones. The two areas to check before buying:
- Very light monitors (under 3.2 kg): small or older 22–24-inch panels may be too light for the spring to hold low without floating up. A budget tension arm can suit these better.
- Heavy 32-inch 4K and ultrawides (over 11.3 kg): these exceed the LX’s rating. Step up to the Ergotron HX (up to ~19.5 kg) instead.
- VESA: the LX supports 75×75 and 100×100 mm. A handful of slim monitors with no VESA holes need a separate adapter plate — check your model.
Pros and cons
| Pros | Cons |
| One-finger repositioning that actually holds position | Costs four to five times a basic arm |
| Solid aluminium build, 10-year warranty | Too light a spring floor for sub-3.2 kg monitors |
| Clamp and grommet both in the box | Heavy 32-inch panels need the pricier HX |
| Excellent built-in cable management | Tensioning is slightly fiddly the first time |
Price and alternatives
At around £150–£180 the LX sits in the upper-middle of the market. [Affiliate link to Ergotron LX on Amazon UK]. If that is more than you want to spend and you set your screen once and leave it, the Amazon Basics single arm at about £30 does the basic job. At the premium end, the Humanscale M2.1 is more elegant but dearer and rated for lighter loads. For two screens, the Ergotron LX Dual stacks two of these arms on one pole. We cover all of these in our best monitor arms roundup.
Verdict: is the Ergotron LX worth it?
Yes. The Ergotron LX is the monitor arm we recommend to almost everyone and the one we measure others against. It is not cheap, but you are buying a piece of kit that adjusts perfectly, holds rock-steady, looks good, and comes with a decade-long warranty — and that you will likely move from desk to desk for years. For a single 24–32-inch monitor up to 11 kg, it is as close to a buy-it-for-life purchase as the home-office world offers. If your monitor is heavier than 11 kg, buy the HX. If your budget is under £50, buy the Amazon Basics arm and accept a slightly stiffer adjustment. Everyone else: the LX is the gold standard for good reason.
