Humanscale Keyboard Systems Keyboard systems have effortless height and angle adjustment Humanscale keyboard trays are solidly anchored to any work surface, and shape to specific user needs Promoting negative tilt keying, the keyboard platforms will not go into a positive tilt Uses a negatively sloped adjustable keyboard tray to maximise time spent working in a neutral hand, wrist and upper body posture Allows the keyboard to be positioned anywhere from 0 degrees to a -15 degree angle