Gripdynamometer (Round balance model)

This is  an  electrical  wooden  box  with  a  metal  head  which has  a  box  with  a  metal  plate  having  nine  holes  of  varying sizes.  This  plate  is  electrically  connected  to  a  reset  type impulse    A  stylus  is  provided  to  insert  into  these holes  in  the  meta  l  plate.  The metal plate is electrically connected to a reset type impulse counter. When the stylus is inserted into the holes in the metal plate by the subject the errors will be automatically recorded whenever he touches the edges of the hole.

This instrument is used to induce fatigue to the hand and the graphical representation of the fatigue lines are automatically drawn on a paper while pulling the weight.