Astrio Magnifier is a screen magnifier for Windows that enlarges the image under the cursor. The Zoom slider sets the magnification level the Window size field defines the magnifier window size and Shape allows selecting its form for example circle Circle. The Frame rate parameter sets the image refresh rate in the magnifier. Additional settings include displaying a border Show border with an option to choose its color Border color smooth scaling Smooth scaling grayscale mode Grayscale and color inversion Invert colors. The Freeze button freezes the current magnified image Hide magnifier hides the magnifier from the screen and Exit closes the program. The magnifier itself is displayed on the screen as a circular area showing the magnified content under the mouse cursor.