If the strip mode does not allow accurate measurements, try the patch mode (readings of single patches).
After printing the appropriate target, select the patch mode after the i1 white point calibration.
Start of calibration:
Set the i1 in its cradle with the white point reference and press the button on the side of the i1:
After about 5 seconds, the i1 should be ready for the first measurement. In this menu select the patch mode by selecting "Patch":
Place the i1 using the guide over the first target and press the button on the side, the i1 should briefly light up with a green light indicating a successful measurement.
Proceed to the next target as shown in the Patch reading window. Continue with the remaining patches: