The ornamental design for a tank for testing and/or treating ears, as shown and described.
FIG. 1 is a perspective top view from the front of the tank of our new design, showing the interior surface of the tank which is not claimed in dashed lines;
FIG. 2 is a perspective top view from the rear of the tank as shown in FIG. 1, showing the interior surface of the tank which is not claimed in dashed lines;
FIG. 3 is a front view of the tank as shown in FIG. 1, showing the interior surface of the tank which is not claimed in dashed lines;
FIG. 4 is a rear view of the tank as shown in FIG. 1;
FIG. 5 is a side view from the left of the tank as shown in FIG. 1;
FIG. 6 is a side view from the right of the tank as shown in FIG. 1; and,
FIG. 7 is a top view of the tank as shown in FIG. 1, showing the interior the tank which is not claimed in dashed lines.
The dashed lines in the figures represent elements that are not claimed.