The ornamental design for a touchscreenmonitor with operationelement, as shown and described.
FIG. 1 is a front view of a touchscreen monitor with operation element, of our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a front perspective front view thereof; and,
FIG. 7 is a rear perspective back view thereof.
The broken lines that are immediately adjacent to the claim depict the bounds of the claimed design, while all other broken lines are directed to environment. The broken lines form no part of the claimed design.