Finally, a reed measuring tool that is accurate and with repeatable measurements.Place your Eb, Bb, alto or bass reed or bigger reed on the table. Lock in place with the clamp and measure it in over 130 different positions. Measures in millimeter and standard inches on the digital dial indicator and is accurate to .0001". The REED MACHINE Reed Mapper comes with Bluetooth capability to store date on your phone or laptop! New! 2022 design. This precision reed measuring device can measure all size single reeds with ease and accuracy. Designed with a Bluetooth feature, dimensional data from any reed can easily be sent and stored on your computer or smartphone spreadsheet app. The Mapper comes set with the clamp in the position for Bb clarinet and smaller reeds. By removing the clampand placing it in the adjacent hole on the table, you can measure larger reeds. Simply unscrew it, making sureto keep the spring in place. The reed clamp adjustment screw on the back of the clamp is for changing theangle of the clamp to help hold reeds more securely. Experiment by raising and lowering the clamp angle untilyou have the best fit for your reed thickness. Blue Reed Rail Stop Each Mapper comes with a blue rail stop. This bar can replace the reed clamp when single and quick spotchecking of reed measurements are desired.