A small, precise 5cm metal ruler on my keychain
I've always loved small, precise metal machinist rulers. I have them handy at home, in drawers and in my garage workshop. As useful as they are I find I never have one with me when I'm out and about - which is when I need one the most.
I'm not a fan of carrying items in my pocket, especially not my shirt pocket - so a six-inch metal ruler just never leaves the house with me. Also, often times all I need to measure is a few inches or centimeters - I rarely need anything longer than that.
Keychain Ruler Hack
I took one of my six-inch metal rulers and turned it into a 2-inch/5cm keychain ruler so that I would always have it with me. It weighs next to nothing, but is precise enough that I can easily measure small items.
It was a pretty simple project:
- I drilled a small hole for it to go on my keychain
- I cut the ruler off at 6cm. This gave me room to have a full 5cm / 2-inch length plus the small drilled hole
- Lastly, I rounded the end of the ruler slightly so that it would be easier to carry
Centimeters on one side, inches on the other.