Why is my Deluxe LCD Digital Microscope #44345 zoom feature not working?

The touch screen controls the functions of this microscope.

In order to use the zoom feature, touch the screen with your forefinger or thumb and slowly drag your finger to either side. You can also use the included stylus in the same way.

Dragging slowly to the right will increase magnification. The magnification will be displayed in the upper left corner of the LCD screen in the range from 1.0 to 4.0. A complete screen drag is typically the value by several tenths of the magnification. You may need to raise the finger off the screen and repeat the process to get the level of zoom that you desire. Dragging left will decrease the magnification.

Updated 12/19/13