Fit finder
Enter your numbers
Compare your screen and desktop with the published limits. These are example values to start with. Include any adapter or accessory carried by the screen mount in the load.
Check the desktop material, clamp landing area, plugs and arm movement separately. A numerical match still needs these checks. A deeply curved screen also needs the maker's confirmation for its tilt head. Rear-space choices change the reminder, not a numerical clearance assessment.
The fit comparison
Compare the published fit limits
All three take 75 × 75 mm or 100 × 100 mm VESA fixings. Check the weight without the stand and include any adapter.
Scroll across the table for every fit check.
| Mount | Screen | Weight | Clamp | Wall check |
|---|---|---|---|---|
| Duronic DM12X1 The short upright | 17–30″ | Up to 8 kg | Confirm with Duronic | No extending elbow. Check rear plug clearance. |
| Invision MX200 An everyday adjustable screen | 19–32″ | 2–9 kg | 10–90 mm | Offset the base if the elbow needs room to fold. |
| Invision MX450 A larger or heavier screen | 24–40″ | 2–15 kg | 10–90 mm | Check the elbow sweep and support under the clamp. |
Eight setups, compared side by side
Each row applies the same illustrative inputs to all three mounts. The results use the fit finder's published-range checks. A range match leaves the desktop material, fixing, movement, screen recess and curved-screen tilt to check separately.
Scroll across on a small screen. Inputs list screen load, diagonal and desktop thickness. Use “Load this example” to reproduce a row in the finder above.
| Example inputs | Duronic DM12X1 | Invision MX200 | Invision MX450 |
|---|---|---|---|
| A 27-inch, 6 kg screen6 kg · 27″ · 25 mm VESA 100 × 100 mm Limited rear space · rarely moved |
Confirm clampScreen and weight match; clamp thickness still needs confirmation. | Ranges matchWeight, diagonal and clamp measurements match the listed ranges. | Ranges matchListed ranges also match; extra capacity does not establish rear clearance. |
| A light 24-inch screen1.5 kg · 24″ · 25 mm VESA 100 × 100 mm Limited rear space · rarely moved |
Confirm clampBelow the 8 kg maximum; clamp fit remains unresolved. | Out of range1.5 kg is below the 2 kg minimum. | Out of range1.5 kg is below this arm's 2 kg minimum too. |
| A 34-inch, 10 kg screen10 kg · 34″ · 25 mm VESA 100 × 100 mm Limited rear space · moved daily |
Out of range10 kg exceeds 8 kg; 34 inches also exceeds the listed diagonal. | Out of range10 kg exceeds 9 kg; 34 inches also exceeds the listed diagonal. | Ranges matchListed ranges match. Curved-screen tilt and folding space remain separate checks. |
| A 95 mm desktop6 kg · 27″ · 95 mm VESA 100 × 100 mm Limited rear space · rarely moved |
Confirm clampAn unpublished clamp range cannot be treated as a match. | Clamp range95 mm exceeds the 90 mm edge-clamp maximum. | Clamp range95 mm exceeds the 90 mm edge-clamp maximum here too. |
| Mounting holes not checked6 kg · 27″ · 25 mm VESA not checked Limited rear space · rarely moved |
Check VESACheck VESA first; clamp fit is also still unresolved. | Check VESAWeight and diagonal do not establish the mounting-hole pattern. | Check VESAA higher load limit does not resolve an unknown VESA pattern. |
| At the MX200 upper limits9 kg · 32″ · 90 mm VESA 100 × 100 mm More rear space · moved daily |
Out of range9 kg exceeds its 8 kg maximum; 32 inches is also outside its range. | Ranges match9 kg, 32 inches and 90 mm are included endpoints, without spare capacity. | Ranges matchThese inputs are within its published ranges; verify the actual fixing. |
| At the Invision lower limits2 kg · 24″ · 10 mm VESA 75 × 75 mm More rear space · moved daily |
Confirm clampScreen and weight match; its clamp range remains unconfirmed. | Ranges match2 kg and 10 mm are included lower endpoints. | Ranges match2 kg, 24 inches and 10 mm are included lower endpoints. |
| A 34-inch screen at 6 kg6 kg · 34″ · 25 mm VESA 100 × 100 mm Limited rear space · moved daily |
Out of rangeIts 30-inch maximum is exceeded even though 6 kg is below 8 kg. | Out of rangeIts 32-inch maximum is exceeded even though 6 kg is below 9 kg. | Ranges match34 inches is within 24–40 inches. Check curvature, tilt and rear movement. |
The boundary rows include the published endpoints: 2 and 9 kg belong to the MX200's stated load range, for example. At a maximum, include every accessory carried by the mounting head before comparing your total. A low screen weight can be outside a gas-assisted arm's range just as a high weight can.
These examples keep unknowns visible. The Duronic clamp range remains unconfirmed at 10, 25, 90 and 95 mm. Its fitting sheet does not state a numerical thickness range, so those inputs cannot produce a confirmed clamp match.
How the finder reaches a result
The table above and the finder use the same order of checks. A result identifies the first reason the entered setup falls outside a range or needs confirmation. Read the other requirements as well: correcting one mismatch does not establish that the rest of the arrangement works.
1. Load: compare the screen without its original stand, plus any adapter or accessories carried by the mounting head, with the selected arm's supported range.
2. Screen diagonal: check the published size range independently of weight. A light 34-inch display can be within the MX200's weight range and outside its diagonal range.
3. Edge-clamp thickness: compare the measured edge with a known clamp range. An out-of-range edge needs another approved fixing or a different mount, not a stronger assumption.
4. VESA and missing data: check the mounting pattern and any recessed fixings. An unknown pattern gives “Check VESA”. The Duronic gives “Confirm clamp” once the other checks are satisfied because its numerical clamp range is unconfirmed.
5. Movement: “Ranges match” means the entered numerical checks match the listed ranges. The rear-space and movement answers change the fitting reminder; they do not calculate an arm path or approve a fixing.
For the selected versions, the MX200's manufacturer specifications give 19–32 inches and 2–9 kg. The MX450 specifications give 24–40 inches and 2–15 kg. Their current edge-clamp drawings show 10–90 mm. Match those drawings to the base supplied rather than transferring a limit from a similar-looking revision.
The Duronic fitting sheet gives 17–30 inches and up to 8 kg but no numerical edge-clamp range. Confirm that dimension for the supplied version. A missing minimum weight is not treated as a gas-spring balancing range: the Duronic is a manually set upright with a different adjustment method.
What moving the clamp can change
On a shallow desk, removing the original monitor stand does not automatically move the screen backwards. The elbow, mounting head and screen casing can still take up the space between the rear edge and the display face. The first useful comparison is the screen position each planned arrangement could achieve.
The three layouts below use a 50 cm worktop. They compare illustrative planning positions with chosen screen-face offsets and rear gaps. Check that the actual arm can achieve the proposed position at your viewing height before using any calculated gain.
Scroll across on a small screen. All figures are illustrative centimetre measurements.
| Planned position | Rear gap | Screen-face offset | Surface in front | Wall to front |
|---|---|---|---|---|
| A · Centre clampElbow planned over the top | 4 cm | 22 cm | 50 − 22 = 28 cm | 50 + 4 = 54 cm |
| B · Side-offset clampElbow planned along the rear | 4 cm | 14 cm | 50 − 14 = 36 cm | 50 + 4 = 54 cm |
| C · More rear spaceElbow planned behind the top | 8 cm | 14 cm | 50 − 14 = 36 cm | 50 + 8 = 58 cm |
An 8 cm difference on the same worktop
Layout A places the screen face 22 cm forward of the rear edge, leaving 50 − 22 = 28 cm in front. Layout B uses a 14 cm offset, leaving 50 − 14 = 36 cm. That is 8 cm more surface in front of the screen without increasing the desk's footprint. It is a potential benefit of a different achievable position, not a promise that moving any clamp sideways will produce that gain.
Check that an offset fixing can still centre the screen in front of the keyboard. A mounting position that looks compact from above may use too much sideways reach, stop the screen going low enough or bring the elbow into a shelf. Keep the screen's full casing and the nearest plug in the drawing.
The room-space cost of a larger rear gap
Layout C keeps the 14 cm screen offset but increases the rear gap from 4 to 8 cm. It still leaves 36 cm in front of the screen, while the wall-to-front footprint rises from 54 to 58 cm. That extra 4 cm comes from the room. Check what it does to the chair and the route behind it.
These calculations use surface in front = worktop depth − screen-face offset, and wall-to-front footprint = worktop depth + rear gap. The stand or keyboard can occupy part of the surface. Eye-to-screen distance is a separate seated measurement. Use the desk-depth calculator to compare your own dimensions and front-space allowance.
Choose the adjustment method your setup needs
Duronic DM12X1: a short upright for a mostly fixed screen
A short upright removes a long folding elbow from the plan. It can be useful when the screen normally stays in one place and its height can be set with the display supported. The mounting head, rear adjustment parts, casing and plugs still need room. The low-profile shape does not establish a zero-gap installation.
Check the 17–30-inch and 8 kg limits, the height you need and the clamp supplied. Duronic specifies a solid wood top and excludes thin MDF. That requirement is separate from thickness; a top does not become suitable just because a clamp can close around its edge.
The short upright
Duronic DM12X1
A short upright puts the VESA plate close to the base and does away with a long swinging elbow. Choose it for one screen that normally stays in the same place.
The head tilts and its height can be set by hand while supporting the screen. Check the height you need and ask Duronic to confirm clamp fit on your measured edge. Duronic calls for a solid wood top and rules out thin MDF.
- 17–30″
- Up to 8 kg
- VESA 75 × 75 or 100 × 100 mm
Invision MX200: adjustable positioning within the smaller load range
For a compatible screen you move frequently, the gas-assisted mechanism offers a different adjustment pattern from a manually locked upright. The 2 kg minimum matters as much as the 9 kg maximum. Include carried accessories in the load and check both the minimum and maximum before adjusting the spring according to the instructions.
Plan an approved fixing position that lets the elbow fold without forcing the screen forwards. The advertised maximum extension describes reach, not the minimum gap behind a desk. Check the movement at the viewing height you intend to use, with the screen's cables connected and slack preserved.
An everyday adjustable screen
Invision MX200
The gas-assisted arm suits a single compatible screen you move between tasks. It frees the desk from a broad stand and gives you a choice of edge clamp or through-desk fixing.
A centred clamp can leave the elbow in the way of the wall. Check whether the clamp can sit to one side while keeping the screen centred. Match the fitting diagram to the base supplied.
- 19–32″
- 2–9 kg
- VESA 75 × 75 or 100 × 100 mm
Invision MX450: a wider screen and load envelope
The selected revision covers 24–40 inches and 2–15 kg. In the 34-inch, 10 kg scenario it is the only one of these three whose listed screen and load ranges match. That comparison narrows the numerical shortlist; it does not verify the tilt head for a particular curved monitor or establish the desktop's suitability.
A deeply curved display places its load differently from a flat screen. Check exact-model compatibility and the supplied tilt-adjustment instructions. The manual has separate instructions for its heavier load band; do not transfer the setup from a lighter screen. Allow for the casing and cables throughout the positions you will use.
A larger or heavier screen
Invision MX450
The MX450 handles a wider size and weight range. It is the shortlist option for a compatible display above the MX200’s 9 kg limit, provided the desktop and tilt head can take it.
The longer arm needs room to move. If your screen is deeply curved, ask Invision to confirm the exact model with the tilt head. Check for the 24–40 inch, 2–15 kg revision.
- 24–40″
- 2–15 kg
- VESA 75 × 75 or 100 × 100 mm
Record the positions that matter
- Mark your screen face and working position
Place the keyboard and mouse where you use them. Mark the display's intended centre and face line, then work backwards to the casing, plugs and mounting head. HSE's workstation guidance gives around eye level and roughly an arm's length away as starting points. Check what you can comfortably read while seated.
- Map the rear gap at more than one height
Measure from the wall or obstruction to the rear worktop edge. Include a windowsill, shelf or skirting board. The elbow can approach an obstacle above the desktop even when the base fits below it.
- Record the screen and carried load
Use the exact monitor model, its weight without the original stand, VESA hole centres, any recess and the weight of carried accessories. Check the screw and adapter requirements independently. Use the VESA guide and monitor-weight guide where those figures are unclear.
- Inspect the full clamp landing area
Measure thickness where the clamp will sit and the flat area beneath the top. Include aprons, rails, drawers and cable trays. Record the material and the furniture maker's mounting requirements; a hollow top cannot be assessed from thickness alone.
- Check the complete movement envelope
Include the nearest wall, screen corners, rear plugs and the cable route in every planned position. On a standing desk, repeat the layout check at the intended desk heights as well as the arm's positions. Leave access to the fixing and adjustment points.
Keep the fixing check separate from arm capacity
Both Invision manuals require the desk to support at least three times the combined weight of the mount, screen and accessories. That instruction concerns the complete support arrangement. It is not a way to convert a desktop's general load rating into approval for a concentrated edge clamp.
Use a flat, sound area where the clamp's contact surfaces can seat as the supplied drawing requires. A rounded lip or rear rail can obstruct that seating inside the listed 10–90 mm thickness range. Read the clamp-clearance guide before treating an in-range thickness as a completed check.
A through-desk fixing may be an option where an edge clamp is unsuitable and the furniture permits it. The Invision diagrams distinguish a minimum 40 mm rear-edge offset for the through-desk hole from the separate gap to a wall. That hole position is not a 40 mm wall-clearance requirement. Follow the exact supplied base and hole diagram; check the hardware and flat support area below as well as above the top.
If neither fixing suits the furniture, compare the original stand or a compatible freestanding mount, including its full base footprint. A reinforcement plate also needs an approved supporting surface. Keep a wall, base or material problem out of a load-only ranking: increasing the arm's kilogram limit does not solve those conflicts.
Common shallow-desk questions
How much gap does a monitor arm need behind a shallow desk?
There is no single gap that establishes fit for every arm. Check the base, elbow, screen casing, plugs and cables at your intended viewing height and through the movements you use. The finder's rear-space option changes a reminder; it does not calculate a minimum clearance.
Can I put a 34-inch ultrawide on a shallow desk?
Check the exact load without the stand, mounting pattern and curvature. The selected MX450 includes 34 inches within its 24–40-inch range. A deeply curved display still needs confirmation for the tilt head, and its sides may project farther forwards than the centre of the screen.
Why does a light screen keep lifting?
A gas-assisted arm needs sufficient screen load to balance its spring. Both selected Invision models list a 2 kg minimum, so a 1.5 kg screen is below their stated range. If the complete carried load is within range, follow the supplied instructions for tension adjustment with the screen installed.
Does a reinforcement plate make any desktop suitable for a clamp?
It can spread contact over a larger area, but the desktop must still be a sound, approved support surface. Check the desk and arm requirements for the exact material, fixing and load. Clamp thickness within a listed range does not establish the strength of the top.
What should I check when using a standing desk?
Check the arm, screen, fixing and leads through the intended desk heights and arm positions. Allow for the highest screen corner, shelves, the rear wall and cable routes at low, high and intermediate settings. The finder does not model desk travel.
Sources and method notes
Source documents and the selected Amazon UK configurations reviewed in November 2026. Product ranges come from the exact models and fitting documents below. The eight finder setups and three planned layouts use illustrative inputs; the diagrams are schematic.
- Duronic DM12X1 product information and DM12X1 fitting sheet — screen range, maximum load, mounting pattern and adjustment method. The material requirement is in the maker's product information; confirm clamp thickness for the supplied version.
- Invision MX200 specifications and current-base fitting instructions — screen and load ranges, edge-clamp drawing and separate through-desk fitting dimensions.
- Invision MX450 specifications and 24–40-inch fitting instructions — selected load revision, clamp drawing, support requirements and load-dependent tilt setup.
- HSE: good posture when using display screen equipment — screen and keyboard arrangement. The illustrative offsets, loads and rear gaps in this guide are not HSE recommendations.
Use the instructions supplied with the actual screen, arm and desk when finalising an arrangement. The product cards link to the selected Amazon UK versions; similar names or revised bases can describe different fitting details.