Epson ET-7750 User Manual page 191

You see a window like this:
3. Refill any ink tank as needed.
Note: To update or refresh the displayed ink levels, click Update.
Note: The ink levels displayed are an estimate and may differ from the actual ink remaining in the ink
tanks. To confirm the actual remaining ink, visually check the ink levels in the ink tanks. Continued
use of the product when the ink level is below the lower line on the tank could damage the product.
Parent topic: Check Ink Levels
Related references
Ink Safety Precautions
191