Hand arm vibration information for workers WorkSafe ToolBox Talk #42: HAND ARM VIBRATION SYNDROME (HAVS) As the majority of our operations involves working with our hands in some capacity whether it is hitting a hammer, using power tools, 10 second finger tap, 10 Seconds Finger tap test. Simple. Powerful. Underrated., We use it daily to assess patients., Ask someone to tap their index finger and thumb as fast as possible for 10 Finger Numbness and Tingling (Median Nerve Mobilization) Spatial patterns of cutaneous vibration during whole hand haptic interactions PNAS