I bought 69 of these at auction.  All are new, most are still factory sealed while some have been opened for inspection.  I'm keeping some to upgrade my home office and selling the rest - going to list 40 to start (I am certain I have a minimum of that many factory sealed) and will add the rest after inspection.

Some of the boxes to have dinged cardboard, but from inspecting how they packaged the contents (providing buffer space and more internal cardboard layers) I can say with certainty that those have no damage to the contents.

Special note for owners of the Rigol DHO 800 / 900 series oscilloscope: This is the VESA mount arm you want.  No gas piston or spring.  It doesn't matter that the Rigol is only a few pounds, this monitor arm will not pop up on you - you don't need to tie it down or add tire weights or any of that, this mounting arm will just work correctly for you.  I have one installed with my DHO914 on my bench.  Also, the brushed aluminium and interior cable routing look super sexy with the Rigol in my completely biased opinion.  I advise buying 20mm countersunk M4 screws and 12mm nylon spacers (spacers meant for M4 screws) to pair with the mount as that is both the cheapest and most easily effective method I have found of adding the required airgap between your VESA mounting plate and the Rigol since it does run hot and needs that airflow.  You can find those for cheap on Amazon.

(DHO802 DHO804 DHO812 DHO814 DHO914 DHO914S DHO924 DHO924S) (forgive me, needed this to be visible for people searching for the specific models of that scope)

Item details:

Update after playing around with the one I installed: *every* hinge is tension adjustable, including the two largest swivels that I originally thought were sealed/not adjustable in the video.  The underside white plastic accent covers do come off, there is a *tiny* slot for a small flathead screwdriver to pop them off with.  Underneath is another 5mm hex head - clockwise to tighten, anti-clockwise to loosen.

So, these are premium monitor arm mounts made by Steelcase.  The arm frames are cast aluminium and the surface finish is brushed aluminium with white accents.  The swivel adjustment joints are detailed finished steel.  The internal cable routing channels are enclosed with white plastic covers which match the white accents.

The VESA head has ~150 degrees of freedom in vertical tilt (full 90 degrees up allowing the monitor to face straight up, approximately 60 degrees available downward tilt).  The VESA plate also has a tool-less connection to the articulating arm head: there is a hinged snap-clamp you open to access a drop-down channel which the back of the VESA plate slides into (it has a steel ring in the back that slides into this) and fits quite snugly.  You then close the snap and that's it, no trying to hold the monitor at the arm while screwing it in place.  This design also means the VESA plate is free-spinning - it can rotate around 360 degrees with no stop, but has just the right amount of friction resistance to make sure that it will stay at whatever angle you rotate it to.  The head mount has one more trick: there is a rubber grommet you can remove from the head which provides you with a groove - you can screw in a steel spacer on the back of the VESA plate which fits into this groove and locks rotation if you don't want it to rotate.

The base has a 180 degree swivel channel which comes lightly pre-greased with a non-staining translucent/white grease to ensure easy gliding of the removable / repositionable stop pin.  The desk clamp allows for a maximum of 1.6 inches opening to slide onto a desk and tighten down.

The swivel stop pin is installed in the default position that is intended for the monitor arm to face forward if the clamp is mounted at the rear of a desk, but has 4 cardinal points it can screw into allowing easy choice of what range of angle you want your monitor arm to swing through.  It can also be removed and left out which gives you full 360 degree rotation.

The white plastic cable routing concealer panels slide-lock and snap-lock into place and are easily installed and removed without damage.  They provide rather nice looking cable management and concealment which means no need for velcro or zip-ties for your cables.

The base post has a convenient low-resistance flexible plastic ring with a split at the back to allow for further easy cable routing that doesn't require you to pull a wire through a hole, only to slip it through the split at the back.

The arm mechanism for raising and lowering is really great - it ISN'T a gas piston or spring, but fully mechanical in design and very well executed.  The effect you feel is that raising the monitor is smooth and easy (as long as you have the resistance setting not locked, but set to allow movement), while LOWERING has mechanically-induced friction resistance.  There is a secondary arm on the underside which is connected to both swivels that operate for up/down movement.  When pressed UP they are lifted off of contact from a friction surface and do not resist motion (again, if you have the adjustment bolts partially loosened - if further tightened they instead present *less* resistance than down motion)), but if pressed DOWN (from monitor weight or manual adjustment) the downward force engages the secondary arm and increases the friction resistance of the swivels.  This is VERY USEFUL because it means there is no gas piston or spring to fight against.  It means that, aside from being able to lock the angle to whatever you want by tightening those adjustment bolts, it also won't snap up if you want to un-mount the monitor.  This means there is no *minimum* weight - if you have a small or ultralight monitor and you've tried to mount on a regular piston mount, only to find that it *always* creeps all the way back up?  Not an issue with this design.  This is an attractive, well-engineered, premium monitor mount.

See video for greater detail.

Technical specifications:

   Capacity

• 24" maximum monitor size

• 15.4 lb maximum monitor weight

   Adjustability

• Dynamic height adjustment

• 9.5" vertical adjustment range

• 17.7" maximum arm height

• 24" focal adjustment

• 360° monitor and arm rotation

• 45° monitor tilt

   Swivel

• 360° swivel range with 180° limiter

• Swivel limiters prevent collision with adjacent screens and walls

   Additional Features

• 75 mm & 100 mm mounting options

• Recedes 3" from back edge of worksurface

• Integrated cable management