There are areas of a website or a software where the mouse cursor has to be moved over a specific element to retrieve context-sensitive information or display additional components (mouse-over or hover effect). Those elements can be represented by tooltips, flyout menus or just icons. If you need measure such an element the mouse cursor may not be moved away.
This is where the PRINT key on your keyboard comes to the rescue. It will capture the entire desktop and save the image in the clipboard of the operating system. After doing that you can start PixelZoomer and click the item Open image from clipboard from the toolbar. The image from the clipboard will be inserted directly and you can start analyzing it.