How do I make sure a monitor arm can actually support my monitor?

Every arm has a rated weight capacity per arm — typically 4 to 22 lbs. Check your monitor's weight in its product manual or on the manufacturer's site, then add a 10–15% buffer to protect the tilt mechanism over time. Most 24–32 inch monitors weigh 8–20 lbs; ultrawides can hit 18–28 lbs and need heavy-duty arms rated 25 lbs or more. FindOfficeFurniture.com lists weight capacity on every arm — call 888-719-4960 if your monitor is on the heavier end.