I fear here I am borderline, but I wanted to show you another application of the smartphone in the shop.
It's a musician's trick or luthier's trick : it's about controling the tension of the blade by measuring the tone when you pluck it.
Read the related article :
La Belle Note - Bandsaw blade tension
It can be measured using any digital tuner, but again, the smartphone, as you always (don't you?) have it in the pocket, is of great help, and for the mater of tuning accuracy, it's really great.
Ken, sorry , there's nothing built here, but a little bit of creativity (I hope so ), maybe you should have a section for tools that are hacked things.
Thanks for reading.