How is the test strip correctly aligned on the JBL PROSCAN COLORCARD?
On the empty JBL PROSCAN COLORCARD you will find grey fields as placeholders indicating how the test strip should be placed. The notes Top and Bottom serve as additional orientation. Since app version 4.0, the app catches alignment errors. After the JBL PROSCAN test strip has been placed, no grey from the placeholder should be visible on any of the fields. It must be completely covered with the colour fields on the test strip.
Behind this is the method of colour detection. The sum of all colours on a field is included in the colour detection. Therefore, the grey must be completely covered. Otherwise, erroneous results will occur.
Example: A white field is darkened by the grey field template and produces a different result. Excess water and associated reflections can cause a similar effect. Each field must be damp/dry with no water stains or wet patches. You can avoid this by correct handling with sideways tapping (do not shake) and a sheet of kitchen roll as an underlay (reflections!). If you receive an error message during the measuring process, it is probably because the test strip is lying crooked on the JBL PROSCAN COLORCARD, so that the grey is clearly visible.