People sharing one screen
If colleagues take turns at the desk or move a display aside for another task, look for an arm that can be repositioned and parked without obstructing the next user.
Who is this for?
People comparing two digital versions
If both versions need to remain visible during proofreading or change checking, assess a dual mount that lets you position each compatible display separately.
People with a large monitor or restricted desk space
A heavy or deep display, limited space beneath the desk, or uncertainty about the worktop makes the monitor’s fitted weight, mount dimensions and desk requirements especially important.
What matters when choosing?
Start with the way the documents will be viewed. A heavy-duty arm is a capacity choice to investigate for an unusually large, deep or heavy display; it can be either a single- or dual-screen arrangement, depending on the model.
Single adjustable arm
Choose it when: One screen moves between users, or the comparison is mainly between a screen and paper.
Trade-off: It will not keep two digital versions visible on separate displays.
Dual-monitor mount
Choose it when: Two digital versions need to stay side by side, with each screen positioned for the task.
Trade-off: The desk must accommodate both displays, their combined load and the mount’s required clearance.
| Concern | What to check | Who this matters to |
|---|---|---|
| Repositioning between users | Check the lift and reach needed at this desk, plus pan, tilt and rotation. Confirm that the fitted display falls within the arm’s stated weight range. | When colleagues take turns, I need to reset the screen without struggling to hold it in place. Around 29% of consumers put easy repositioning first. |
| Monitor and desk compatibility | Match the display’s fitted weight, depth and VESA mounting holes to the exact model. Check desk construction, thickness and the specified clamp or grommet requirements. | If my monitor is heavy or the desk edge is restricted, I need confidence that the complete setup can be mounted as instructed. Compatibility is the primary concern for around 29% of consumers. |
| Two versions on screen | For a dual mount, check each display’s permitted weight and mounting pattern, then allow room to position both screens at the intended angles. | For detailed digital comparison, I want both versions in view rather than switching one screen back and forth. Around 24% of consumers chiefly need that side-by-side layout. |
| Usable work surface | Measure the rear edge, space beneath the desk and where the arm will sit when folded back; account for nearby shelves and the cable route. | When printed pages share the desk with a keyboard, I need the screen support to leave room for the documents. Keeping that surface clear comes first for around 18% of consumers. |
Buying pitfalls
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Choosing by screen size alone
Two displays of the same diagonal size can place different demands on an arm. Ergotron notes that display depth can affect the capacity of its HX Desk Monitor Arm, and an arm’s minimum supported weight matters as well as its maximum.
Check the exact display’s fitted weight, depth and VESA pattern against the chosen model’s instructions.
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Assuming any desk will accept a clamp
Mounting limits belong to the specific product. Ergotron specifies a 1–6.6 cm desk-clamp range for its HX dual arm; Invision’s MX450 instructions require the desk to support at least three times the total weight of the mount, monitor and accessories.
Inspect the worktop, edge and space beneath it, then follow the installation requirements for the mount you actually choose rather than another model’s limits.
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Treating an arm as the whole workstation solution
Screen position is only one part of a workable setup. The Health and Safety Executive also addresses the relationship between the screen, keyboard, chair and user when giving display screen equipment guidance.
After installation, adjust the workstation as a whole. For applicable workplace use, follow the employer’s workstation assessment process.
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Buying a dual mount for a mainly single-screen desk
A second display adds load and takes space to position. Those requirements may not serve a desk where people usually compare one screen with printed pages.
Decide whether two digital versions genuinely need to remain visible together before choosing between a dual mount and a repositionable single arm.
Brands to consider
Compare specifications at model level: a brand’s single, dual and heavy-duty mounts can have different display and desk requirements.
Ergotron
Ergotron offers LX single-arm and HX heavy-duty single- and dual-arm configurations relevant to different shared-desk layouts.
- Ergotron specifies a 3.2–11.3 kg display range for the listed LX Desk Monitor Arm. Its HX dual arm is specified for two screens up to 32 inches, with a 4.5–15.9 kg combined capacity and a 1–6.6 cm desk-clamp range.
- The listed LX SKU is marked as discontinued or phasing out; check the exact specifications of any replacement model rather than assuming they carry over.
Humanscale
Humanscale has lighter-duty single-monitor and configurable multi-monitor options for desk workstations.
- Humanscale describes the M2 Pro for monitors up to 22 lb and for use with traditional and sit-stand workstations.
- M/Flex capacity and mounting requirements depend on the selected configuration; check that configuration for every display you intend to fit.
Invision
Invision lists separate MX200 single, MX400 dual and MX450 heavier single-arm models.
- Invision lists the MX200 and MX400 for 19–32 inch, 2–9 kg displays, and the MX450 for 24–40 inch, 2–15 kg displays.
- The MX450 manual requires a desk able to support at least three times the total installed load. Apply that requirement to the MX450, not automatically to other models.
Joybuy product choices
This dual-monitor desk stand is relevant when two digital document versions need to remain visible together. Check its fit with both monitors and the shared desk before choosing it.
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DELL Pro Dual Monitor Stand MDS19
This dual-monitor stand suits a desk where two digital versions need to stay in view. Before ordering, confirm the mounting pattern and fitted weight of each display against the stand’s specifications, and check that the desk can support the assembled setup.
Frequently asked questions
Do I need a dual mount to compare two document versions?
Choose a dual mount if both digital versions need to remain visible side by side. If you mainly compare one screen with printed pages or pass a single display between colleagues, a repositionable single arm addresses a different, simpler layout.
What should I measure before buying a desk-mounted arm?
Check the display’s VESA mounting holes, fitted weight and depth, then measure the desk thickness, mounting position and available clearance. Compare each measurement with the exact mount’s specifications and installation instructions; screen size by itself cannot establish compatibility.
Where should the screen sit after I fit the arm?
The Health and Safety Executive advises placing the top of the screen around eye level and the screen about an arm’s length away. Adjust the screen and the rest of the workstation for the person using the desk rather than assuming one fixed position will suit everyone.
Does a shared office desk have to have a monitor arm?
UK display screen equipment guidance calls for an assessment of applicable workstations and action to reduce risks, rather than prescribing a monitor arm as the solution. The Health and Safety Executive says employers must assess workstations for workers who use display screen equipment daily for continuous periods of an hour or more; the appropriate changes depend on that assessment.
Who pays if a home-working assessment identifies a need for equipment?
The Health and Safety Executive says workers cannot be charged for action an employer’s display screen equipment assessment identifies as necessary. Whether that action involves a monitor arm depends on the individual workstation assessment.