This looks like it would do what you want: http://www.kickstarter.com/projects/david-toledo/the-practical-meter-know-your-power?ref=discover_pop http://www.kick

This looks like it would do what you want: http://www.kickstarter.com/projects/david-toledo/the-practical-meter-know-your-power?ref=discover_pop http://www.kickstarter.com/projects/david-toledo/the-practic...