[Rails] uom gem

Hi all,

I’m beginner with ruby and rails... I’m creating one personal project (to learn more..) and for this project I need measure something using height cm and kg. I saw the uom gem ( https://github.com/madriska/uom) that I think that make this job, with ActiveRecord Integration.
Could anyone, please, send me some examples or information of how can I include this gem in one new project and starting to use? I’m using rails 3 with ruby 1.9.2