After starting this function in the menu "Measure" - "Drills",

click on 5 points, one after the other (see lower image):

Point 1+2 on the outer diameter on top,

point 3 on the root diameter on top,

point 4 on the root diameter below, as well as

point 5 on th eouter diameter below.

After the fifth click, the result immediatly appears in the

following order:

- flank diameter

- outer diameter

- root diameter