Getting the right size baton
Typically, a baton should compliment your body geometry. Generally speaking, a baton should be approximately the length from the inner base of your forearm to the middle joint of your middle finger. However, if you are directing a very large group, you might want a slightly longer baton. If you are conducting a choir or small ensemble where you are closer to the musicians, you might prefer a slightly shorter baton.
Either a video or a photo showing how to measure your arm in order to get the perfect length baton.