The Chordal Height Gage (a.k.a. DO Gage) is designed to be used for measuring the opening heights of turbine vanes at specific locations to verify that an aircraft engine will get proper air flow. The new Chordal Height Gage is part of the Starrett line of special area flow gages.
The size of the Chordal Height Gage is determined based on the specific application it will be used on, and the new gage is no larger than a tissue box. Despite the small footprint of the gage, it has three independent probes which are used to take measurements, including a free-floating central gage body which allows the middle probe to take accurate readings along the trailing edge, regardless of the variable contours which are often on these nozzles.
