graduator

Noun

 * 1) One who graduates (determines or indicates graduation).
 * 2) An instrument for dividing any line, straight or curved, into smaller regular intervals.
 * 3) An apparatus for diffusing a solution, such as brine or vinegar, over a large surface, for exposure to the air.
 * 1) An apparatus for diffusing a solution, such as brine or vinegar, over a large surface, for exposure to the air.