Hi All
OK, I'll go first.
He is my favourite "unusual tool that I find useful":

It is a binocular dissection microscope, in case any of you were wondering.
USE:
It's a simple but amazingly powerful bit of kit that I originally got second hand. We used them a lot at university. In truth I now only use it rather occasionally, as I've started using "Clip On Flip Up Magnifying Reading Glasses" which make you look a bit nuts but are super-useful. I tend to use "+1.0" or "+2.0"…

…But when you need to see what's REALLY going on when you are working at a small scale – e.g. when you need to do some precision fettling, or what's happening to the blade of your knife, or checking something for micro-cracks, or even remove a pesky splinter from your finger…. nothing else comes close!
Being binocular, everything really 'pops' into 3D and you can work for long periods of time if required…
J
PS In an age of digital everything, it's a refreshing change to use something that is 100% NON-digital! Lovely bit of kit.
Edited By John Smith 47 on 04/06/2021 00:39:36