JOHN BISSET/Stuff Vibration Action founder Jason Johnstone has the rarely diagnosed Hand-Arm Vibration Syndrome (HAVS) and has developed a watch monitor to help prevent other power tool workers from suffering with it. A former smelter worker has spent $100,000 of his own money developing a monitoring device to prevent others from getting the little known disabling syndrome he has been diagnosed with. Jason Johnstone had worked with power tools for most of his adult life when his fingers started going numb and pale. He ignored the problem despite dropping dishes and other items as he struggled to hold onto them.