The Inchworm is an EDC (Every Day Carry) tool from TEC Accessories that you keep on your keychain. It’s a 3 inch long 6Al-4V grade titanium rod of 3/16″ diameter with grooves cut at 1/8″, 1/2″ and 1 inch increments with a bead blasted matte finish surface. Having a small ruler always at your fingertips can be really handy. The Inchworm costs $18.00 and is available now from TEC.
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Is there a metric one?
I carry a SwissTool everyday. It has both a standard and metric ruler on it’s sides. Plus it’s a multi-tool.
I have the Ruler + application on my phone. Takes up zero additional space and comes in Metric and get-with-the-times-already Imperial.
Cost = Free!
You mean the centipede?
@Jhon
Nyuk-nyuk-nyuk! Metric system humor! 
I am extremely lucky. Long ago I discovered that the length of the large wrinkle in my thumb middle joint to the first bit of white on my thumbnail is exactly one inch.
And the length of the wrinkle to the base of the thumbnail is about 1/2 inch.
So I’ve been able to do rough measurements for years without having to get out any keychain, etc.
I do really like the look of this product, but I think cutting up an old Schaedler rule and putting it on a keychain would be better.
More increments. Metric systems. As well as picas and points.
Or, you could always get a keychain measuring tape for $2, which goes up to 1m ( or 3.2 feet for you metric challenged Americanos), with markings in both cm and inches.
Chriszzz:
You really couldn’t intimidate someone with a tiny $2 tape measure — never mind bludgeon them over the head with it…
I like tools with multiple uses!
Of course, at 3 inches, this isn’t much better. But one could grind the tip to a point… or get like 3 or 4 of them and have them tooled to screw together to form a baton.
And then, when your victim lay motionless on the ground, you can effortlessly measure his or her foot size!