IHT is the world's largest manufacturer of Meridian Stress Assessment instrumentation. Our devices are used by health care practitioners around the world to scientifically assess functional health. Our EAV (ElectroAcupuncture by Voll) systems combine state of the art hardware coupled with world class technical support and a highly sophisticated software application that scans a proprietary virtual library of over 65,000 items which offers the ability to create custom protocols and is supported by a highly qualified medical advisory board made up of prominent industry professionals.