Kett HK-300-1, Руководство по эксплуатации

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(3) The measurement cannot be made because the temperature
of the unit is below -5°C. Bring the temperature of the unit up
to the operating temperature range (0 to 40°C), and make the
measurement again.
(4) The measurement cannot be made because the temperature of
the unit is above 50°C. Bring the temperature of the unit down
to the operating temperature range (0 to 40°C), and make the
measurement again.