Researched comparisonLast updated September 2026 · How we review
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Quick Answer
The Kensington SmartFit is the lowest price at $55.99 and lists support for monitors up to 32 inches and 17.6 lbs. The Fellowes Platinum ($107.99) lists a 3 year limited warranty and a 3.3 to 17.6 lb range. The Ergotron NX ($118.00) lists a 5 year warranty and the Ergotron LX Pro ($199.00) lists a 10 year warranty and up to 22 lbs. All four are single monitor desk clamp arms available on Amazon.
- Kensington SmartFit Space-Saving: best for buyers who want a space-saving arm for a screen up to 32 in and 17.6 lb at the lowest price.
- Fellowes Platinum 8043301: best for buyers who want a gas spring arm with USB ports in the base for a screen up to 32 in.
- Ergotron NX: best for buyers who want a 34 in screen capacity and a 5 year warranty.
- Ergotron LX Pro: best for buyers with heavier monitors (4 to 22 lb) up to 34 in who want a 10 year warranty.
Prices as of September 30, 2026, 9:40 pm CT.
A monitor arm lifts your screen off the desk, frees up space, and lets you set the height and distance. This comparison puts single monitor arms from Kensington, Fellowes, and Ergotron side by side on price, weight range, size limit, and warranty.
How We Chose
We compared four single monitor desk clamp arms from three established office ergonomics brands. All four offers are available on Amazon. We also looked at Humanscale, and the Ergotron LX Classic, but the offers we found were from third-party resellers, so we left them out. The arms are not identical. The weight limits differ (up to 17.6 lbs for Kensington, Fellowes and the NX, and 4 to 22 lbs for the LX Pro), the maximum screen sizes differ (32 inches for Kensington and Fellowes, and 34 for both Ergotron arms), and the LX Pro is a higher tier product than the others. Arm prices change with color, so check the exact variant. Specs and warranty terms come from each manufacturer’s own pages, and each table cell names its source. Fellowes’s spec sheet and install manual disagree on screen size, weight and clamp range, so we show both. The Amazon listing for the Fellowes says 40 inches and 5 years, which Fellowes’s own documents do not show, and Ergotron’s spec sheets do not list clamp thickness, so those cells come from the Amazon listing. Kensington’s warranty page was not readable. This is a researched comparison, not a hands-on test, so we make no claims about how smoothly any arm moves or how well it holds a heavy monitor over time. Prices are Amazon prices checked in September 2026 and can change.
The Lineup
Prices as of September 30, 2026, 9:40 pm CT. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. Amazon may show a different seller than the brand or Amazon.com. Certain content that appears on this site comes from Amazon. This content is provided “as is” and is subject to change or removal at any time.
Kensington SmartFit Space-Saving Single Monitor Arm K55512WW, Black
$55.99 as of Sep 30, 2026, 9:40 pm CT on Amazon · lowest price, space-saving
Best for: buyers who want a space-saving arm for a screen up to 32 in and 17.6 lb at the lowest price.
Kensington’s page describes a low profile arm made for shallow spaces with a preinstalled C-clamp that faces the front of the desk, a height range of 9.4 to 18.5 inches, tilt and swivel, and rotation between landscape and portrait. It supports monitors up to 32 inches and 17.6 lbs, and it is listed as compatible with sit and stand desks. The C-clamp fits desks up to 3.3 inches thick and the grommet mount fits desks up to 1.5 inches thick. The Amazon listing states a 2 year warranty, and Kensington’s warranty page was not readable. It is available on Amazon.
Check Price on Amazon →Fellowes Platinum Series Single Monitor Arm for 40-Inch Monitors, Black, 8043301
$107.99 as of Sep 30, 2026, 9:40 pm CT on Amazon · gas spring, USB ports in base
Best for: buyers who want a gas spring arm with USB ports in the base for a screen up to 32 in.
Fellowes’s spec sheet for part 8043301 lists a gas spring arm for a single monitor up to 32 inches and 17.6 lbs, VESA 75×75 and 100×100 patterns, 360 degree rotation, plus or minus 45 degrees of tilt, two USB 3.0 ports and a 3 year limited warranty. Its install manual gives different limits (30 inches and 20 lbs), so check the manual for your monitor. The Amazon listing says 40 inches, and Fellowes’s own documents do not show that. It is available on Amazon.
Check Price on Amazon →Ergotron NX Single Monitor Arm, VESA Desk Mount, White
$118.00 as of Sep 30, 2026, 9:40 pm CT on Amazon · 5 year warranty
Best for: buyers who want a 34 in screen capacity and a 5 year warranty.
Ergotron’s spec sheet lists an arm for monitors up to 34 inches and 0 to 17.6 lbs with VESA 75×75 and 100×100 patterns, 180 degrees of pan, 35 degrees of tilt, 360 degrees of portrait and landscape rotation, and a 5 year warranty. The Amazon listing says the desk clamp attaches to worksurfaces up to 2 inches thick, which the spec sheet does not state. It is available on Amazon.
Check Price on Amazon →Ergotron Upgraded LX Pro Premium Monitor Arm, Single Monitor Desk Mount, Matte Black
$199.00 as of Sep 30, 2026, 9:40 pm CT on Amazon · highest price, 10 year warranty
Best for: buyers with heavier monitors (4 to 22 lb) up to 34 in who want a 10 year warranty.
Ergotron’s spec sheet for the LX Pro lists screens up to 34 inches and 4 to 22 lbs with VESA 75×75 and 100×100 patterns, 13 inches of lift, 85 degrees of tilt, a 360 degree base pan and a 10 year warranty. The Amazon listing says the two-piece desk clamp fits desks 0.4 to 2.4 inches thick, and the spec sheet does not state that. It is available on Amazon.
Check Price on Amazon →Our Take
If you want the lowest price, the Kensington is $55.99 and is the only one that lists a space-saving design. If you have a larger monitor, the two Ergotron arms list up to 34 inches, the largest in Ergotron’s and Kensington’s own documents. The Ergotron NX is a mid-priced arm with a 5 year warranty, and the LX Pro costs the most and lists the widest weight range and a 10 year warranty. Check your monitor weight and VESA pattern first, since that decides which arms fit. We did not test any of them.
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Frequently Asked Questions
How do I know if a monitor arm will fit my monitor?
Check the weight and screen size limits in the listing and make sure your monitor has a VESA mounting pattern of 75×75 mm or 100×100 mm. The Ergotron listings name both patterns. Check the manual for your monitor if you are not sure.
Will a monitor arm work on a standing desk?
The Kensington listing says it is compatible with sit and stand desks, and Kensington lists a C-clamp and a grommet mount. Check the desk thickness and the clamp range for the arm you buy.
What is the difference between the Ergotron NX and LX Pro?
Ergotron’s spec sheets show the NX with a 0 to 17.6 lb range, 35 degrees of tilt and a 5 year warranty, and the LX Pro with a 4 to 22 lb range, 85 degrees of tilt, and a 10 year warranty. The LX Pro also costs more.
Do monitor arms have USB ports?
Fellowes’s spec sheet lists two USB 3.0 ports. The Kensington, Ergotron NX, and Ergotron LX Pro pages did not mention USB ports in the fields we checked.
