It's made as a generic tool so that it cannot be left in the dipstick tube.

Slide it down the dipstick tube until it bottoms out, then read the level from there.

Level has to be checked at the proper temperature with the car running.

Mercedes really went out of their way to make sure that tube remains empty.

__________________
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record