Its Friday - time for a little fun discussion.
Is your favorite tool your needle nose pliers or your microscope? Your DVM or your breadboard? Your 3D printer or your oscilloscope? Your power supply or your computer?
Or does your orderly mind balk at comparing apples and oranges?
I can kick it off with the candidate that pops into my mind at this moment - my Mitutoyo calipers:
Add a picture below
Mine was attending to more of a 'soft wear' issue... 
For me it has to be this bench power supply
Prior to having this power supply I used to use 9V batteries which always performed poorly or use some power adapters and I almost always had to rely on voltage regulator ICs to get the desired voltage output.
This bench power supply has made my life easier and helped me build many projects. I can get desired voltages, set current limit, and even generate dual voltage supply needed for differential amplifiers and opamps..
That needs an explanation.....
... or maybe not.
