Split Ergonomic Keyboards

Two independent key clusters define this style, joined by a cable or running fully wireless, placed as far apart as your shoulders. A conventional keyboard measures 300 to 440 mm wide while adult shoulders sit 360 to 460 mm apart. That means reaching one board pulls the hands together and bends the wrists outward. That outward bend is called ulnar deviation, and separating the halves removes it by letting each hand work under its own shoulder. Many models add tenting, meaning the inner edges lift 10 to 30 degrees, which cuts the forearm rotation needed to lay your palms flat.

Fixed-angle boards keep both halves inside one case with a wedge between them. They correct the wrist angle but not the distance, and the angle cannot be tuned to your body. A fully separated pair can be. Some layouts also stagger the columns so each finger travels straight up and down instead of along the diagonal rows inherited from typewriters.

Mechanical Keyboards let you choose the feel but keep both hands on one plank. Low-Profile Keyboards attack height rather than width. Vertical Mice make the same forearm argument on the pointing side. Pairing the two is common because typing and mousing pull the arms in different wrong directions.

Discomfort in the forearms, wrists or shoulders after long typing days is the reason to try this, as is noticing your shoulders round forward to meet a narrow board. Expect two to four weeks before your speed returns, longer if the layout also relocates keys or splits the space bar. Expect to feel clumsy on other people's keyboards during that time. It suits a shared desk poorly, since the position is tuned to one body.

Set the halves to the distance between the two bony points at the front of your shoulders. Look for adjustable tenting rather than a fixed wedge, a connecting cable long enough for your desk, and remapping stored on the board rather than in software you cannot install at work. On a wireless pair, ask how each half charges and whether one runs flat before the other. None of this is treatment: persistent pain, numbness or tingling needs a clinician.