The method is for MeasureMaster and it returns MeasureElement for a master measure feature.
getMeasureElementExpressions
The method is for MeasureElement and it returns an array of expression objects for a measure element of a measure feature.
getMeasureElementExpressionsType
The method is for MeasureElement and it returns an array of strings that corresponds to the expression types for a measure element of a measure feature. You should generally use this method in conjunction with getMeasureElementExpressions() to pass along the same index value to find the expression and expression type associated with a MeasureElement.