HF scientific Micro1000 Laboratory Turbidimeter - 0-10,000 NTU - Manual (Page 17)

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3. When the instrument has completed the calibration, the “Cal” and the “Store” blocks will quit
flashing and the lower row of the display should now indicate that the 1750 NTU standard is the
next standard to be used for calibration (1.75 K).
Press the key to indicate to the instrument that you plan to calibrate on this point.
4. Invert the 1750 NTU calibration standard several times to mix prior to use.Insert the 1750 NTU
calibration standard into the sample well and calibrate as before. When the instrument has
completed the calibration, the “Cal” and the “Store” blocks will quit flashing and the lower row
of the display should now indicate that the 10000 NTU standard is the next standard to be used
for calibration (10.0 K).
5. If you plan to measure turbidity levels above 1750 NTU you must calibrate using a 10000 NTU
calibration standard (not included in the calibration kit). If you do not plan to measure turbidity
levels above 10000 NTU then use the arrow buttons until the lower row of the display shows
100.0 and then proceed to step #6. Otherwise, Invert the 10000 standard several times to mix
then insert the standard into the sample well and calibrate as before. When the instrument has
completed the calibration, these blocks will quit flashing and the lower row of the display should
now indicate that the 100.0 NTU standard is the next standard to be used for calibration.