[Anything with a metal/plastic dipstick]
I can think of nothing as disconcerting as pulling out to find the end missing. After all it's that bit on the end that makes the whole thing a viable tool. With out the end, it's just, well, ...a stick.
So you've lost the end, and dipping seems pointless now. To the point that you'd probably not even bother any more. But don't give up just yet. There is hope. You are not alone.
It's a common problem unfortunately, and one of the biggest worries is "What of my end? Where is it, and will it do any damage?" Here's what to do:
Procure a new dipstick, carefully slide it into the tube. If it seats right down into it's normal parked position without having to use excessive force then all is well. The broken end will have dropped into the sump. It can't do any damage down there so don't worry about it.
There are one or two different dipsticks this is by far the most common. If in doubt give us a tinkle