Theo Wanne

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The Theo WanneTM tip opening gauge's digital readout makes measuring the tip opening size of any mouthpiece accurate and easy to understand. With this gauge you do not need to depend on the inaccurate tip opening size marked on mouthpieces, you will know the real tip opening and how it relates to other vintage and new mouthpieces. Indispensible for anyone who owns multiple mouthpieces, does mouthpiece work, or sells mouthpieces.