Epson ES-50 Maintenance Sheet 2 Kit (often referenced by the global part number B12B819481) is a consumable accessory designed for the routine cleaning and calibration of the Epson WorkForce ES-50 and other similar portable document scanners (like the ES-60W, DS-70, DS-80W, etc.).
 
Purpose: This sheet is used in conjunction with the scanner's utility software (Epson Scan 2 Utility) to recalibrate the sensor.
Benefit: Helps remove dust and paper residue that can cause streaks, spots, or poor feeding. This sheet can usually be reused multiple times