Select a pointing device that fits the 'size and shape of your hand. Use light tapping movements to depress the buttons on your pointing device. Avoid excessive force. Determine which adjustments are necessary for your work environment and match the tray to your needs. Select a tray with a properly designed top for your environment and job functions.
Trays come in different lengths and angles to accommodate pointing devices, calculators, etc.
Determine your need to use or store your keyboard tray under your tabletop. If frequent repositioning is required to complete your work tasks, consider purchasing a keyboard tray with easily controlled adjustments. Determine adjustments required. Risers will provide a fixed height and table position for single users. Make sure adjustments are easily made for multiple user situations.