Vishay make just the tool:
When I started out in broadcast engineering some 22 years ago, I was given, somewhat ceremonially, a Spectrol trimmer just like that one. This was in the still all-analog times, so a lot of distribution amps, meter bridges, oscillators, et al. needed copious adjusting. Therefore, carrying the trimmer was part of the tools of the trade. Had it been 20 years earlier, I'd stuck it in my pocket protector on the lab coat, but as this was in the late 90s, I merely kept it between two buttons of my polo shirt.
I lost my original one in a tool case theft, but as that was on the job, I got funds to get all new tools. I now have two, for good measure, in the heavily expanded iFixit
Pro Tech Toolkit I carry mostly for its tweezers and the insane screwdriver bit kit. Expansions are another screwdriver kit, F Dick jewellers files, pin chuck, some wire-wrap tools, small hand vice, cable marker fitting tool, et c. It all goes, together with lots of other tools, in a leather tool case from Canford. Very BBC-y.
Tool collection completeness is a complementary disease to TEA.