HF scientific Micro1000 Laboratory Turbidimeter - 0-10,000 NTU - Manual (Page 23)

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Select the desired number of days between scheduled calibrations by pressing either the S or T
keys to change the displayed day. In normal automatic mode, if you exceed this number of days
between calibrations, the Cal block will flash until you re-calibrate the instrument. When you have
selected the desired calibration interval press the key.
6.7. Setting the Date (Year, Month and Day)
With the Year block highlighted and the year displayed, change the displayed year using either the
S or T keys. When you have selected the proper year press the key to accept the year.
After pressing the key, the Day:Month block will be displayed and you will see two numbers on
the upper row of the display. The number flashing corresponds to the month.
Select the correct month by pressing either the S or T keys to change the displayed month. When
you have selected the proper month, press the key. After pressing the key, the
Day:Month block will remain displayed and the second number on the upper row of the display will
be flashing: this number corresponds to the day of the month.