http://rc4less.com/Motors,_Brushed_&_Brushless/c19/p139/RC4LESS_Analog_Magnet_Gauge/product_info.html

I have never used one but I guess if it shows which one of your rotors is stronger than the others it is good enough.Unless you want to compare numbers from the net which would probely be diffrent anyway because even alike meters read diffrent from each other rite?

Jake

I'd love to find someone who actually has one of these and can tell us if it works.

It works, I can see differences in a few of my rotors. Most are very close to the same....Unless you want to spend around $280 for a real meter then this will work just fine. If you want a real meter goto http://www.trifield.com/gauss_meter.htm

http://rc4less.com/Motors,_Brushed_&_Brushless/c19/p139/RC4LESS_Analog_Magnet_Gauge/product_info.html

Thats an amp meter you can get at Radio Shack.
Works great and its alot cheaper than a gauss meter.