My first league match as a captain, some opponent on a court I was not playing on started griping our nets were too high. Lucky for me, one of our spectators was is also a USTA referee. He knew the right height, broke into our clubhouse, pulled out a yardstick, and went and measured the net. Unfortunately for the opponent, turned out the net was 1/4 inch too low. He raised the net for her. At the end of the season, as captain I bought the entire team cute little tape measures with the tapes marked at the right net height, just in case it ever came up again. I am surprised how many times I've had to pull it out because people think the nets are the wrong height. And even stranger, most the time they are right. As for the using the racquet measurement....30 something years ago, when I played with wooden rackets, you could do the height x width net measurement. But back then all racquets were the same size. With the advent of the oversized heads, that's not all that accurate a measurement anymore.