There's another process (hack if you will) that can be used IF (big if) you own a Spectrophotometer as well as such a Colorimeter, whereby you use the Spectrophotometer first:
How to use an i1Pro to create an offset for an i1Display (or similar), using SpectraView as an example, but it may be doable with other software products:
Background:
The two devices can be used in combination to create a correction offset which will lead to much better results. This involves first calibrating the display with the i1Pro measuring the resulting white point with the i1Display and creating a new target based on that measured white point.
Steps:
1. Connect the i1Pro
2. Select the desired Target in SpectraView and calibrate the display.
3. Confirm that the calibrated white point is acceptable (judge 100% white only).
4. Disconnect the i1Pro and connect the i1Display.
5. Open the SpectraView Preferences dialog.
6. Re-detect the color sensor.
7. Change the "Primary Colors Chromaticity Source" to "Factory Measurement"
8. Click OK. (for other software products, you may need to jot down the CIE xy values rather than what is stated below in step 4)
Next, you will create a new Target with a custom white point that has been adjusted with the offset between the two devices:
1. In SpectraView, click the "Edit Target settings" icon.
2. Click the "Edit..." button in the "White Point" group.
3. Click the "Measure" button and measure the white patch on the screen using the i1Display.
4. The CIE xy values should be filled in automatically.
5. Click OK.
6. Click OK.
7. Enter a new name for the Target file.
8. Make sure the new Target is selected, and calibrate using the ii1Display.
The white point should match what you got with the i1Pro and the greyscale should be much better.
The i1Display Colorimeter is more ideal for calibration of the display** but the Spectrophotometer is going to give you a better offset. Once that's been measured, just stick to using the Colorimeter.
**http://www.lumita.com/site_media/work/whitepapers/files/xrite-wp-3a.pdf