How to perform an air and water zero on a non-computer based refractometer.

Step-by-step instructions to perform an air and water zero on a non computer based refractometer.

1. Clean the prism very well and cover the prism.
2. Select Menu
3. If prompted, enter passcode 123
4. Select Service Calibration
5. Enter passcode 519
6. Select Air Zero
7. Exit to the main screen
8. Select Zero and follow the screen commands

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