Detail 01
US and metric numbering
Both numbering systems are included in the same gauge set.

Independent shopping perspective
Theo Wanne’s all-in-one feeler gauge set is for accurately measuring mouthpiece tip openings with both US and metric numbering in one set. It includes a 3mm (.118-inch) gauge as part of its range. Paired with a Theo Wanne glass gauge, it can also measure the facing curve on saxophone and clarinet mouthpieces, keeping those two measurement tasks in a single gauge set.


Strong match
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
Both numbering systems are included in the same gauge set.
Detail 02
A large 3mm gauge is included.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
Yes. With a Theo Wanne glass gauge, it can be used to measure facing curves on clarinet mouthpieces.
Yes. The set includes a 3mm (.118-inch) gauge.