foo, be VERY carefull using that auto ampmeter. I have one that goes to 60 amps. Have used it over a year. A couple months ago I hooked it to a Castle Creations PHX60/20cell set up. After doing some quick/short motor runs the controller fryed 4 FETS!!! I've been told that over 40-45 amps you can't use this kind of ampmeter, and I believe that. A $50 learning experience! The Astro Flight Watt meter is great. I now own a Medusa Power Analyzer Plus. You can hood the MPA plus to the computer run the motor and it will plot volts, amps, power (watts), watt hours & amp hours on individual graphs. You can change the prop, battery, gear, whatever & overlay the new test over the previous graph to see exactly what the difference is. Great tool? YES! Is it expensive? YES! $75-80, but well worth it I think. If I had it sooner, it wouldv'e saved me $50 (over half what it cost). But I'm sure it will save me money in the future (like from running lipo's over their recomended C rate). Happy fly'n to all!