Abstract: A volume meter 1 for measuring the volume of cups in a printing device has a reservoir formed by an indentation 5 in a foil 3. In the reservoir there is a viscous substance 11 comprising grease mixed with a colorant. The volume meter 1 has an adhesive 17 for fastening to a screen. The foil is free over an area 18 of the adhesive 17. This area 18 is larger than the spot that the viscous substance 11 covers after the spreading in the cups with the help of a doctor blade. The size of this spot is a measure for the volume of the cups and can be read with the aid of a scale division present on the foil 3. The indentation 5 in the foil 3 has such a form that the foil 3 does not fold double if a doctor blade is passed along the indentation 5, and the foil 3 at the place of the indentation 5 is pushed against the screen with the doctor blade in order to push the viscous substance 11 out of the reservoir.