As people said before, there are no pure experimentalists or theorist. It is more like a superposition of both.
However, I just want to add some side note, experimentalist seems to need to have grasp of everything.
For instance, when I looked into one of my professor research, which is about nuclear physics, he needs to have some knowledge of condense matter to construct the Superconducting Magnet Assembly (some equipment, in short). And he needs some knowledge of chemistry to understand some of the tested molecule properties, etc.
So yes, basically he needs to know almost everything.
Side note: This actually make me think of a joke: don't let physicists construct the experiment and don't let engineers do the experiment if you don't want to ruin your experiment.