Hach POCKET COLORIMETER II Instruction Manual page 66

Error Codes,
8. Underrange—flashing number below stated test range
•
Verify instrument cap is correctly seated.
•
Check zero by measuring a blank. If error recurs, re-zero the instrument.
•
If the problem persists, contact a Service Center
Note: See Maximum/Minimum Displayed Value on page 2—26
9. Overrange—flashing number above stated test range
Note: Flashing value will be 10% over the upper test limit.
•
Check for light blockage.
•
Dilute and retest sample.
Note: See Maximum/Minimum Displayed Value on page 2—26
continued
2—12
(page 2—37).
for more information.
for more information.