The arm bow corrector is not just a learning aid for a bow stroke that is straight, i.e. in an 90° angle to the string, it is also a unique training device for ambitious amateurs and professionals. Beginners can quickly learn how to move the arm correctly and how to keep their contact point.
Students can monitor their movements and correct their mistakes. They will perceive wrong movements may it be a wrong stroke, a change of the contact point or their jamming of the bow. For advanced players, the "abc" is a continuous monitor of their bowing and helps them to practice a slow and steady bowing speed. Prof. Christoph Henkel who invented this device is a cellist himself. Until recently, he has worked as a professor at the University of Music in Freiburg. He has evolved his first version considerably. After long research on the material to use, "abc" will now be made of plastic. Thus the device cannot damage the bow. The material stress was tested thoroughly so that "abc" now has a firm, non-slip grip on the fingerboard.