I was pretty much thrown in and learnt on the job. I shadowed another technician for a bit that showed the basic maintenance servicing steps for the major machines, but then went out on my own. I'm in Australia and we had instruments in all major cities as well as New Zealand, so it involved a lot of flying around and fitting in as many customers as possible. So I had to be able to troubleshoot fast and ideally fix things on the spot.

Often it involved figuring out a temporary workaround whilst a part would need to be ordered from the US or similar issues. My main skillset was being able to think quickly like this and improvise. Being able to understand exactly what a machine is doing (not just the theory the lab techs were thinking about, actual things like gas fill reservoir A, valve 3 open to reservoir B with vacuum guage etc) was more important than anything else I feel. Especially considering we were a small company so couldn't afford to carry around every conceivable spare part, not much of the machinery was based on off-the-shelf parts so we mostly carried the most likely parts to be needed in general.

My IT background was mostly useful for dealing with the inevitable issues with their terrible 16-bit era (!!) software and trying to get it running on Windows 10. Of course the manufacturer wanted them to just replace the system with the new model, but they were exactly the same internals with just newer controller cards running (very very slightly) updated software. This would cost up to a quarter of a million dollars, so you can imagine that not many customers were excited to jump on that!

I would say the automotive technician skillset likely overlaps a little better, especially if they are from the electrical side. My IT skills were useful as I mentioned (and I could talk-the-talk with the university or corporate IT teams in order to get required permissions etc) but most of the harder problems were physical and electronic in nature. As you mentioned, I was interested in the science part too, and funnily enough a couple of the universities got me in to teach the theory of what the systems were measuring, which I literally just figured out on the job haha

Of course, this all depends on exactly what kind of equipment you are talking about. For reference, I mostly dealt with gas adsorption, mercury porosimetry, laser or vision particle sizing and helium pycnometry. We also worked with a few other bits and pieces here and there, but that was the vast majority.

Oh, in terms of pay, I took a massive pay cut to work there. I'd been in IT for about 12 years and needed a change. I knew the boss of the company from Judo training and he asked if I'd be interested in joining. Not the most normal career path but I figured it sounded interesting.

Sorry for the rambling structure, I'm at work and was jumping back and forth to here as I could.