I just ordered this watt meter from Hobby King. Turnigy watt meter and power analizer $23.95 or get your self a watts up meter at about $54.00 in the U.S. Another basic watt meter from Hobbypartz.com I think it is a PL-1 or something close to that at about $30.00. Of the three that I mentioned the Watts Up is the best one, but they all will keep you from frying your motor or ESC.