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Use for taking mouthpiece measurements. Design based upon a system devised by Erick D. Brand and utilizes a piece of clear glass upon which is etched an easy to read numbered scale. With the mouthpiece held against the glass, the user inserts various steel feelers between the mouthpiece rails and the glass to plot the curve of the facing and determine the lay of the mouthpiece. For steel feelers any all purpose feel gauge set starting with size 0.0015" will work.

Dimensions: 4" (102mm) x 1" (25.4mm) x 0.187" (4.75mm).