If a market is in a well-defined trading range, the magnitude of that range is the "measure". For example, if soybeans have been "stuck" between $6.50 and $7, a 50-cent range, for the past several weeks, you expect the breakout of the trading range to make a move of atleast 50-cents, i.e. a "measured move", up to $7.50 or down to $6.
I might interpret measured move to mean something a little bit different. For example: Suppose a $50 stock is trending upward, and then makes a downward correction of $3.00 and then continues upward. A measured move might mean that at some higher price there could be another correction equal to the $3.00 "measured move".