This is the question we get asked the most in-store, and the honest answer depends entirely on how you work - not just how many monitors you own.
Go with a single monitor arm if:
- You run one main display 17" to 35" and want it fully adjustable - height, tilt, swivel, and rotation.
- You want to eventually add a second arm later without buying a whole new dual mount.
- Your desk space is tight and you'd rather keep things minimal.
Our single-arm options are the Kaloc KLC-DS110/B (17-35", supports up to 10kg, sturdy SPCC steel body, -50°/+35° tilt, full 360° swivel), the Kaloc DS110 (17-33", also up to 10kg, with a manual tension knob so you can dial in the resistance to match your exact monitor weight), and the Kaloc KLC-DS200 (17-32", up to 9kg, gas-spring assisted movement, extends out to 542mm).
Go with a dual monitor arm if:
- You genuinely run two screens side by side - coding, trading, video editing, customer support, streaming overlays, or general multitasking.
- You want each screen to move independently (one in portrait, one in landscape, for example).
- You're trying to consolidate two separate desk stands into one clean, space-saving mount.
For that, we carry the Kaloc KLC-DH200 (17-35" per screen, up to 9kg per arm, gas-spring height adjustment from 503mm-575mm, full 360° rotation on each side) and the Kaloc DS110-2 (17-33", gas-strut mechanism for smooth one-hand adjustments, built-in cable management channels to keep both screens' cables tidy). Both let you position each monitor completely independently, which single-post "dual" stands (where both screens share one fixed crossbar) simply can't do.
The mechanism matters here too. Three of our models - the KLC-DS200, KLC-DH200, and DS110-2 - use a gas-strut (gas-spring) mechanism, the same kind of hydraulic assist used in office chairs and car boot lids. It means you can lift, lower, or push the monitor with one finger and it holds position exactly where you release it, with no separate tightening knob required - smoother if you reposition your screen often during the day, for example switching between sitting and standing, or turning your screen to share with a colleague. The DS110 and DS110/B use a more traditional tension-adjustment system instead - a screw you turn once during setup to match the arm's resistance to your monitor's weight, after which the arm holds firm. Both approaches are equally reliable; it really comes down to how often you expect to move your screen.
Installation is the same across the whole range: every arm ships with both a C-clamp (grips the desk edge, no drilling - the right call for rented spaces, glass-topped desks, or anyone who might rearrange furniture later) and a grommet mount (goes through a drilled hole for a lower-profile, more built-in look - better for permanent office furniture). Neither method needs tools beyond what's in the box.
Rule of thumb:
If you're not sure yet, a single arm is the safer first purchase - you can always add a second unit later. If you already know you're a two-screen person, buying a proper dual arm from day one saves you money over buying two separate single arms.