Measureing draw/amps
 

I've seen a few graphs to display how many amps/voltage/current on a run for batteries when used in R/C cars. What device do I need to do this?

The best is the Eagletree Systems (www.eagletreesystems.com)

Medusa Research also offers as system with data logging capability but my preference is the Eagle Tree. I have the Eagletree Car System.