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1. Click button"Start" to begin the test.
2. Click one of the three small squares which color matches the large test pane above them. Each click is a sample point. The bottom bar shows the total test number and the score quality gauged by margin of error.
3. Repeat step 2 untill achieving satisfactory score quality ("very good" is recommended, "excellent" is the highest quality).
4. Click button "Finish" to see the results.

The quality of the test dependst on the quality of the display device (e.g. CRT).  Tom Niemann's ePaperPress is a good Web site for helping calibrate monitors.