MERIT INDUSTRIES Megatouch XL, Technical Service Reference Manual

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3. To compensate if the screen is not calibrated accurately, return to the calibration
screen. Recalibrate the way you normally would, but don’t touch exactly on the center of
the dots. This time, touch slightly away from the dot, in the SAME direction and
approximate distance which the dot was off center (see Figures 3a and 3b). For
example, if the crosshair comes up slightly below where you touched, when you
recalibrate, touch slightly below the calibration dot, if the crosshair appears slightly
above and to the right of where you touched, when you recalibrate, touch slightly above
and to the right of the dot. This should compensate for the individuality of the
touchscreen glass and the way it was mounted on the CRT.
It may take several attempts to get the screen calibrated exactly.
Figure 3a Figure 3b