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Desk
Ergotron LX Desk Mount Monitor Arm
A single-monitor arm whose spec sheet answers all four questions that decide whether an arm works.
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Who this is for
Someone mounting a monitor between about 7 and 25 pounds without its stand, on a desk edge 0.4 to 2.4 inches thick or with a grommet hole. Not for a light sub-7-pound panel, which sits below the spring's minimum and floats upward, and not for a 40-inch or very heavy display, which is over the top of the range.
What to check before you buy
These are attributes you can verify yourself on the listing or in the product photographs, without taking anyone's word for it.
- The VESA pattern and screw sizes stated, with screws and spacers in the box
- A load rating given as a range, with your monitor's stand-less weight inside it
- Clamp jaw capacity in millimetres or inches, checked against your measured desk edge
- A grommet mount included, with the required hole diameter stated
- A tension adjustment described as user-serviceable, with the method given
- Stated maximum reach alongside the folded minimum, not just the maximum
Where it is likely to fail
Sag. A gas strut loses pressure as its seals age and a coil spring takes a small permanent set, so the screen sits a little lower each month. An arm whose tension screw still has travel can be rewound; a spent sealed strut cannot. The second failure is the desk: a clamp concentrates force on a small footprint and can dish a laminate or crush a hollow-core top, which is what the grommet option is for.
The honest caveat
Ergotron rates this 7 to 25 pounds and publishes a 10-year parts commitment, but the tension is set with a hex key rather than a hand knob, so adjusting it means finding the tool. Weigh your monitor without its factory stand and confirm it clears the 7-pound minimum; a panel under that drifts up no matter how loose you set the spring.
The reasoning behind these criteria is in the full guide: Monitor arms: the four numbers that decide whether it works.
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