FIG. 1 is a top, left front perspective view of a combined writing surface and storage tray for attachment to an institutional-type scale showing my new design;

FIG. 2 is a right side elevational view, the left side being a mirror image;

FIG. 3 is a front elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a rear elevational view; and

FIG. 6 is a bottom plan view thereof.

The fragmentary support member of a scale depicted by means of broken lines in FIG. 1 is shown for illustrative purposes only and forms no part of the claimed design.