The Musical Ruler takes a ruler and adds a musical element just like the name implies. So when you next find yourself measuring something you can also break out into song.
You get the ruler as well as a guide and songbook. How do you play a ruler? Well, you manipulate it’s length with your fingers at different keys, just like an instrument. If you play well enough you can put on a concert, maybe even be the world’s foremost Musical Ruler player some day.
This combination instrument and tool is just $12 from Amazon.