We just use a bathroom scale and tip the robot up on one edge, balancing it with one finger, While this is admittedly kind of dicey, it is accurate enough so that we have a good idea whether we are legal or not. When we have gone to a scrimmage or regionals for an official weigh in, we generally aren't to far off the mark, and we haven't had to shell out $$$ for a pricey scale, or drive to a different location to get an estimate of weight. Quick and cost effective.
