Previously dipsticks measured the distance from the top of the tube to the fluid level. The new transmissions measure the depth of the fluid by using a stick that is considerably longer than the distance to the bottom of the pan. What you then are measuring is the distance from the bottom of the pan to the surface of the fluid or the depth. Such a dipstick will not fit installed into the tube and as such is a tool rather than part of the car.
Most manufacturers have become ultra sensitive to the exact level of the fluid in the trans. This has to then include measuring it at a specific temperature. While this is easy to do using the diagnostic computer it is also easy enough to do with a Raytek infrared temp measuring tool
http://www.flw.com/rayt_ol1.htm?gclid=CJejifGA75ECFQZzHgod-G9Spg
There are other cheaper versions out that are probably accurate enough for these measurements.