Choose a single adjustable monitor arm if you mainly work on one display, including when referring to paper invoices; consider a dual arrangement when accounts and digital invoices need separate screens at the same time. Before ordering, check each monitor’s VESA mounting pattern and weight without its stand against the chosen arm, then check that its mount fits your desk. For positioning, the UK Health and Safety Executive advises keeping the top of the screen at eye level and the display about an arm’s length away.
If you regularly compare accounting software with digital invoices, spreadsheets or email, two independently positionable displays may suit the workflow. Check that the chosen configuration supports both monitors and fits the desk.
If accounts stay on one monitor while you refer to paper invoices or switch tasks, a single adjustable arm may be sufficient. The Health and Safety Executive’s screen-positioning guidance makes usable height and depth adjustment worth checking for your workstation.
If your monitor is heavy or has a non-standard mount, or the desk edge has little clearance, establish that the exact arm fits before comparing its range of movement. Manufacturer specifications for Ergotron and Fellowes arms illustrate why both display and desk requirements are model-specific.
Choose when: One display handles your accounts work and invoices are paper or do not need a separate screen.
Trade-off: The arm positions only one display; it does not hold the paperwork beside it.
Choose when: Accounting software and digital invoice files need to remain visible on separate displays.
Trade-off: Two displays need more mounting space, and each must fit the selected arm or arms.
| Concern | What to check | Who this matters to |
|---|---|---|
| Monitor and desk compatibility | Match the monitor’s VESA pattern and weight without its stand to the arm’s full supported range. Measure the proposed mounting point and its clearance. | With a heavy display or a crowded desk edge, I need to know the arm can be fitted before its adjustments matter; around 33% of consumers put compatibility first. |
| Flexible viewing position | Compare the arm’s height and reach with your desk depth and working position. The Health and Safety Executive advises a screen top at eye level and a viewing distance of about an arm’s length. | When I change tasks at one screen, I want to reposition it without changing my whole desk setup; around 27% of consumers prioritise flexible positioning. |
| Accounts and invoices in view together | Decide whether invoices are digital or on paper. For two displays, check screen count, each display’s supported weight and the space the arrangement occupies. | If I compare invoice files with accounts throughout the day, I want both visible without switching between them; around 27% of consumers put simultaneous two-screen viewing first. |
| Desk clearance and cable control | Check space beneath and behind the mounting point, then confirm the exact variant’s clamp, grommet or other mounting option and cable routing. | With drawers or cables close to the desk edge, I need a layout that fits the space I use; around 13% of consumers make desk clearance and cable control their primary concern. |
Screen size does not establish whether the mounting holes or display weight fit an arm. For example, Ergotron lists the LX Desk Monitor Arm for VESA 75 × 75 mm or 100 × 100 mm mounting and a display weight of 3.2–11.3 kg.
Find your monitor’s mounting pattern and weight without its stand, then compare both with the exact arm variant.
A different arm or a compatible adapter may be needed if the mounting pattern does not fit.
A suitable monitor does not guarantee a suitable desk mount. Ergotron specifies a 1.2–3.2 cm desk-edge thickness for its LX under-mount C-clamp; space beneath and behind the edge matters too.
Measure where the arm will attach, including obstructions such as drawers or cable trays. If a clamp cannot fit, check whether the exact product offers another mounting method suitable for your desk.
A second monitor mount positions another display, not physical documents. It may occupy mounting space without making paper invoices easier to view beside your accounts screen.
Decide whether invoices are mainly digital or paper. For paper, position the screen appropriately and consider a separate document holder if you need the paperwork near your viewing line.
The LX Desk Monitor Arm illustrates a single-display route for a monitor that fits its stated mounting and load requirements.
The Tallo range includes single, dual and larger multi-display configurations, with mounting options that vary by model.
M2 Pro is a configurable arm route for lighter monitors on a traditional or sit-stand desk.
A monitor arm is not a device specifically required by the UK display screen equipment guidance published by the Health and Safety Executive. The HSE says DSE regulations apply to workers who use screens daily for continuous periods of an hour or more; choose an arm if it helps you achieve a suitable workstation setup.
Check the monitor’s VESA pattern and weight without its stand, plus the desk edge and available space beneath and behind it. Compare those measurements with the exact arm and clamp: Ergotron, for example, specifies a 1.2–3.2 cm desk-edge thickness for its LX under-mount C-clamp.
The Health and Safety Executive advises placing the top of the screen at eye level and the display about an arm’s length away. Arrange the screen and keyboard centrally in front of you, then adjust the arm alongside your chair and desk setup rather than relying on arm movement alone.
One arm can position your accounts display, but it cannot hold paper invoices. If paperwork needs to stay near the screen, consider a separate document holder; if invoices are digital and need their own display, assess a dual-screen arrangement instead.
Check the warranty and its conditions for the exact arm you intend to order, not just the brand or range. The cited Ergotron LX listing states a 10-year warranty, while Fellowes states a 15-year limited warranty for Tallo and a 5-year limited warranty for its Platinum range; the cited Ergotron 45-241 model is discontinued.