Does anyone know if the Transmission dipstick sold for the E-320 (W210) through various websites can be used by itself, requires other specialized equipment ???

I have a 1999 E-320 and would like to be able to check the Transmission fluid level. There are no leaks and the Transmission works fine as far as I can tell, but it bothers me that I can't check the darn level in there.... Any suggestions??

Thanks in advance