Enter your current monitor’s weight (check its spec sheet, without the stand) and its VESA mount pattern if you know it, and see which of the arms we’ve actually checked will hold it. Based on our published spec study of 10 monitor arms, not a live guess.
Don’t know your monitor’s VESA pattern? Flip it around and measure the four screw holes on the back, or check the manual. Most monitors up to 32 inches use 100x100mm. Full method and the complete spec table: We Checked 10 Monitor Arms’ Published Specs.