Specifications: This apparatus is used for the study of touch senses. This apparatus activates when the user insert their palms below the tack tray, the tray will acknowledge every sensory nerves of the user?s palm, and the picture of their palm will be displayed on the rectangular stainless steel tray of size 48x48 cm. This is set-up on a 60x60 cm rectangular table and 80cm in height.