What is negative tilt on a keyboard tray?

Negative tilt means the back of the keyboard is lower than the front — the keyboard slopes away from the user. This position promotes a neutral wrist posture (wrists straight, slightly extended) for users who type with arms at approximately 90 degrees. Positive tilt (back higher than front) increases wrist extension and is less ergonomic for most users. Most commercial keyboard trays support both positive and negative tilt. At OfficeFurniture2go.com, keyboard tray tilt range is listed in each product's specifications — call 1-800-460-0858.