Magnifier button is used to magnify (enlarge) a certain area of the image.
Assign the mouse button to Magnifier function . Click the selected mouse button on the desired image place - image area is enlarged. The enlarged area can be dragged to another place of the image to magnify it. The small circle shows the center of the enlarged area.
You can change magnification in this area with the help of mouse wheel from 1x (no enlargement) to 50x. To enlarge, press the selected mouse button and scroll the mouse wheel until the desired magnification is reached. The actual magnification value is displayed on the bottom left corner of the active viewport (M x [magnification coefficient]):
Figure 19. Magnification coefficient of Magnifier tool