The best way to find the True Video Magnification is to use a Mag-Checker and Ruler or Caliper.  Here are the steps you need to follow:

1. Place the mag checker on the measuring stage and focus on a circle that fits inside the field of view.

2. Set the video zoom to 1:1 

3. Measure the circle on the video screen with a ruler or caliper.

4.  Divide the measured diameter on the screen by the size of the diameter of the Mag-Checker circle.

Note that both screen size and camera size affect the true magnification.

Here are the approximate true magnifications on a 25" monitor for the current model Swift Pro units: