Elitegroup H70 - Manual (Page 45)

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C ALIBRATION < 4 PTS CAL >
Correct 4 point locations on the screen with the panel, screen
displays as follows: Touch the blinking symbol on panel until it
stops blinking.
A DVANCED < 25 PTS CAL >
25 point calibration is more accurate for touch sensor. In general
case, it does not need to do 25 points calibration other than bad
linearity sensor.