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Thermo Fisher Scientific Alpha pH 190 (In the process of updating the brand guideline & product image) User Manual

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NOTE: Buffer must be within ±1.5 pH of the value you are
calibrating to or Err1 will be displayed flashing. To clear the Err1
display and return to calibration mode, press ▲ / ▼ keys together.

NOTE: If the ATC mode has been selected and the Pt 100 is not
connected or if it is broken, the pH display will flash. Under this
condition, the calibration will not be allowed.