Using an i-phone as a tool to measure grades

[Fluesheet]

So, is it cheaper (provided you already own the iPhone) to build that, or to buy the tool from Micromark?

What? There's a tool?!!!?

My guess is much cheaper. I bought the styrene too long ago to remember what I paid for it, but I'd be surprised if I had more than $1.50 in it.

Matt