Kapro KAPROMETER K7 Manuel D'utilisation page 38

8. When step 2 is finished, lay the device down on the table with
the LCD screen facing up.
9. Press the button
2 short beeps will be heard. "CAL3" will appear on the screen,
and a long beep notification that calibration step 3 has finished.
10. When step 3 is finished, turn the device 180° on the table with
the LCD screen still facing up.
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, to continue the self-calibration (3rd step).