$65.00 USD

Humanscale 900 Standard Platform Keyboard Tray System Technical drawing for Humanscale 900 Standard Single Mouse or Dual Mouse Keyboard Tray

We offer a full line of durable keyboard and mouse platform options created to meet the needs of a wide variety of individuals, workstations and office environments. Each of our platform options is designed to ensure that users type and mouse within their Neutral Reach Zone, thereby encouraging safe, sustainable working postures.

By combining one of these platform options with one of our award-winning mechanisms, you will create the most non-intrusive, intuitively adjustable keyboard support available. Humanscale 900 Standard Keyboard Platform is made of phenolic, an ultra-strong, remarkably thin (1/4 inch) composite that is non-toxic, durable and easy to clean.

Standard 900 platform is designed to support nearly all standard keyboards and to fit most desks. Available with any of our mouse options. Dimensions: 19" W x 10-5/8" D.

Keyboard Systems - In many ways, a keyboard support is the heart of an ergonomic workstation. As reach and vision drive posture, an articulating keyboard system allows the user to sit in a healthy, neutral posture through bringing the keyboard and mouse to the user. A well-designed articulating keyboard system offers protection from carpal tunnel syndrome, neck and back pain and other musculoskeletal issues. Since 1995, Humanscale has been the leading manufacturer of articulating keyboard systems and today sells more than all other manufacturers combined.

Effortless Use - Humanscale patented keyboard systems have effortless height and angle adjustment. Promoting negative tilt keying, the keyboard platforms will not go into a positive tilt.

Durability - Humanscale keyboard trays are solidly anchored to any work surface, and shape to specific user needs. Hypoallergenic Gel palm supports offer height and durability, and are designed to be compatible with human skin.

Customization - Humanscale offers three negative-tilt keyboard systems, from 5G to our latest 6G, which combines easy dial-a-tilt and height adjustability with the strongest, most stable arm on the market. Humanscale keyboard supports come in many different configurations, including left/right customization, to support any user need.

Design Story - An ergonomically designed keyboard is essential for every workstation. Ergonomists agree that the healthiest typing posture is one that allows the wrists to maintain a neutral or slightly pronated posture - straight or bent at a slightly downward angle. For that reason, Humanscale designers created our keyboard systems to allow the keyboard to positioned anywhere from 0 degrees to a -15 degree angle.

A decade of ergonomic research shows that using a negative sloped adjustable keyboard tray maximizes the time spent working in a neutral hand, wrist and upper body postures. These postural benefits can’t be achieved by just using a keyboard on a height-adjustable work surface." - Dr. Alan Hedge, Cornell University

The Neutral Reach Zone
The Neutral Reach Zone is the area that can be conveniently reached with a sweep of the forearm while the upper arm hangs in a natural position at the side. (Sanders & McCormick, 1993)

Unlike older generation keyboard/mouse solutions, our platforms are designed to ensure that nearly all users are able to work consistently within their Neutral Reach Zone, and thus maintain a low-risk, sustainable posture.

Neutral Reach Zone

Option 1 - Color

  • Black

  • White

Option 2 - Arms Type

Humanscale 2G Adjustable Keyboard Arm Mechanism


Humanscale 5G Height Adjustable Keyboard Arm Mechanism


Humanscale 6G Adjustable Keyboard Arm Mechanism


Humanscale 5GSM Adjustable Short Arm Keyboard Mechanism


Humanscale 5GAD Above Desk Adjustable longer Arm Keyboard Mechanism


Option 3 - Track

Refers to the under-desk mounted track that the mechanism slides along. Measure the amount of flat space you have on the under-side (from front to back of your desk) to determine which track length best suits you. The longer the track you are able to fit, the farther underneath the desk you will be able to slide the platform. The track measures 5-1/2" in width and is available in seven lengths:

11" Track

For real small Desks at least 11" deep "from front to back"

14" Track

For real small Desks at least 14" deep "from front to back"

16" Track

For real small Desks at least 16" deep "from front to back"

18" Track

For smaller Desks at least 18" deep "measure from front to back"

21 3/4" Track (Standard)

For use with 22" deep Desks "measure from front to back"

25" Track

For deeper Desks with up to 25" depth "from front to back"

27" Track

For real deep Desks with up to 27" depth "from front to back"

Option 4 - Track Length

  • Desk has more than 22" clear space under desktop, front to back

  • Less than 22" & more than 18" clearance under desktop, front to back

  • Less than 18" & more than 16" clearance under desktop, front to back

  • Desk has less than 16" & more than 14" clear space under desktop, front to back

Option 5 - Mousing Platform

Clip Mouse - The only mousing platform that lets users adjust their mousing position in all three dimensions for maximum comfort. With height, depth, lateral and tilt adjustability, it can be positioned where it is needed for truly custom support. It can also be easily moved from one side of the keyboard to the other for left- or right-handed use.

Height - Clip Mouse platforms model 90 and 91 can be in one of the two positions. Position one is parallel and to the side of the keyboard. Second position is approximately 1.5" above and over numeric keypad/keyboard.

Clip mouse adds minimum of 4" to maximum of 10" to either side of the keyboard platform. Clip mouse is not recommended for In small and tight areas areas such as small cubicles.


Clip Mouse (for right or left hand)



Clip Mouse (dual for both hands) 90D


High Clip (for right or left hand) 90H


High Clip (dual for both hands) 90HD


Clip Mouse (for right or left hand) 91


Clip Mouse (dual for both hands) 91D


High Clip (for right or left hand) 91H


High Clip (dual for both hands) 91HD

Humanscale Clip Mouse Platform

Side View of Humanscale Clip Mouse Platform

Clip Mouse "side view"

Humanscale Clip Mouse Platform positions

Clip Mouse "positions"

Humanscale 90D Dual Clip Mouse Platform

Clip Mouse - 90D Platforms "for both hands"

Swivel Mouse - Attached to our standard keyboard platform, which is designed to support nearly all standard keyboards, the swivel mouse provides a wide range of adjustability within the Neutral Reach Zone. 8 or 10-inch platforms are available in left, right and dual positions.


Swivel Right



Swivel Left



Swivel Dual



Swivel Right



Swivel Left



Swivel Dual


Humanscale 11R right Swivel Mouse Platform

Humanscale 11D Dual Swivel Mouse Platform for both hands

Swivel Mouse - 11D Platforms "for both hands"

M2 Mouse - A unique platform solution that provides maximum keyboard accessibility without minimizing the size of the mousing surface. Recommended solution when the numeric keypad is infrequently used.

M2 Right


M2 Left


M2 Dual


Humanscale M2 right Mouse Platform

Humanscale 81D Dual M2 Mouse Platforms for both hands

M2 Mouse - 81D Platforms "for both hands"

Option 6 - Lateral Slider

Humanscale LS Lateral Slider Mechanism Accessory for Keyboard Trays

Humanscale Lateral Slider allows the platform to be adjusted left or right a total of 8" for optimal keyboard positioning. It can be ordered with any keyboard mechanism by indicating "LS" after the mechanism code (e.g., 6GLS or 6GWLS).

Option 7 - Palm Rest

Humanscale Palm Rest Support

Available with either a foam or gel core, our synthetic leather palm supports are comfortable, durable and easy to clean. Our standard palm supports are available in black. However, as with our platforms, other colors can be made available on request.

Option 8 - Corner Solution

Humanscale DE100 Corner Sleeve

Humanscale DE100 Corner Sleeve

DE100 - 29.5" x 12.188"
Fits desks 1" to 1.5" thick

Humanscale DE200 or DE250 Corner Sleeve Solution

Humanscale DE200 or DE250 Corner Sleeve

DE200/250 - 16" diameter
DE 200 fits desks 1" to 1.5" thick
DE 250 fits desks 1.5" to 2.5" thick

Humanscale DE400 or DE450 Corner Sleeve Solution

Humanscale DE400 or DE450 Corner Sleeve Solution

DE400/450 - 38.5" x 13.75"
DE 400 fits desks 1" to 1.5" thick
DE 450 fits desks 1.5" to 2.5" thick

Option 9 - Mouse Pad

Humanscale MPGEL8 Mouse Pad

11R, 11L and 11D Compatible
8" Mouse Pad with Gel Palm

Humanscale MPGEL10 Mouse Pad

12R, 12L and 12D Compatible
10" Mouse Pad with Gel Palm

Humanscale CMPGEL Mouse Pad

10" Clip Mouse pad with Gel

Humanscale CMPGEL8 Mouse Pad

8.5" Clip Mouse pad with Gel

Humanscale HSMP12TIPS - 8" and 9" 12-Tips Ergo Mouse Pad

8" and 9" 12-Tips Ergo Mouse Pad

  • Modular keyboard tray that supports almost all standard keyboards, fits most desks
  • Ensures typing and mouse usage in a neutral zone providing ergonomic relief
  • Add keyboard arms, track, mousing platform, palm rest, mouse pad according to your preference
  • Tray is 19" width x 10 5/8" depth
  • Please see, if you want a keyboard tray with a dual mouse platform
Model 900
Manufacturer Humanscale
Part Number 900
Dimensions 19" W x 10-5/8" D
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