One point calibration
Due to tiredness, and the prospect of yet another 11 hour day in the office tomorrow, I was only able to measure one potato. Despite this rather pathetic attempt at calibration, it's a heck of a lot better than it used to be. It felt really good to hold the potato up to the screen and read the right answer back.
![Potato being measured](http://static.flickr.com/46/140523590_cca1cc127f_m.jpg)