Tip: if anyone ever asks why you have some item on your person, just reply “well, you never know when you might need one”. It won’t work 100% of the time, but usually it successfully shifts the onus from you having to justify it to them having to argue that needing it is intrinsically unlikely, and most folks will let the matter drop rather than be put on the spot.
I have successfully used this tactic to justify carrying a spectroscope around with my in my bag at all times.
A small one, at least.
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#101 Uses for Infrastructureless Computers
Brinens and Things 