I built a construction fixture [red item at the bottom in the photo above and top red item in the photo below] that exactly matched an original SAAB trans dip stick, so when the stock of dip sticks have been sold, I whip out the fixture, and make up some more of them.
This photo shows seven [of a dozen] freshly completed dip sticks plus the original Saab dip stick [red, top next to the fixture]. I add the "MIN" and "MAX" notches, as per the original. Now, y'see, all you have to do is remove the fill plug with a 3/8" drive extension, dip the dip stick into the trans, pull it out, read the oil level, add if necessary, put the fill plug back into the transmission case, wipe off the dip stick, and if you're a neatnick, you didn't even get oil on your hands. PLUS, your transmission stays properly oiled and happy. By the way--SAAB used to offer these dip sticks through their dealers. Since that is no longer an option to the vintage Saab owner, I thought it would be a good idea if I made the little buggers available. Good stuff, huh?