Epson WorkForce ST-M3000 Monochrome MFP Supertank Printer - Manual (Page 229)

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You see a window like this:
3. Refill the ink tank or replace the maintenance box as needed.
Note: To update or refresh the displayed ink level, click Update .
Note: The product has a low ink alert system. The accuracy of this system depends on the user
refilling the ink tank correctly. The product cannot directly measure the ink level in the tank; instead it