Here is my tiniest tool I always have in my pocket on my key ring. Small pliers, small cutter, Phillips, Flat blade and 1-1/8" scale in 1/8" divisions.
Also have multiple tool kits involving multi tools, small screwdrivers etc in many of my vehicles, but my key chain "tool" is always with me in my pocket everywhere and it has passed thru airport security unlike a multi tool with knife blades.
