I do not recommend to balance your propellers with those 'cheap' (the same unit goes from 6 dollars to 110!!) propellers found in ebay like that that has 3 red bars and cyan cones for props adjustment. I had to balance the balancer!! Both cyan cones are not balanced. Anyway, it is almost impossible to do that successfully. The magnet axis does not hover on both ends, it adheres to one of the poles and hovers the other end. Well, you'll get different behavior if yo change the hover end.