Hanna Instruments HI 4421 - Manual (Page 23)

23
Calibration
Using DO standards
The meter can be calibrated in a single or multi-points (up to two points), using 2 DO standards (0.0%, 100%)
or using the custom standards.
The following options are available for calibration:
Standard Recognition
The user can choose between Automatic recognition (from 2 Hanna standards available) or User Standard .
• Use or to highlight the Standard Recognition
option.
• Use or to choose from Automatic or User
Standard option .
• Press to confirm your selection or press to
cancel operation.
Calibration Reminder
This option allows the user to set the calibration reminder as Daily , Periodic or Disabled .
To set the calibration reminder:
• Use
or to highlight the Calibration re-
minder option.
• Press to confirm your selection and then use
or to choose the desired option .
• Press to confirm your selection or press to
cancel operation.