... /blue/orange/red Item No.: 868CProduct name:Wrist ball with COUNTER Description:Shell material: a grade PCRoller material: Zinc-alloy ... musicians,guitarists, pianists,drummers.-Rehabilitates sore muscles and joints.COUNTER OPERATION- How to startPress the button ON/CLR to ... The third symbol, while the rotor is stationary, this counter setting will automatically display the highest RPM ever achieved ...