PC Based Hand-Arm Vibration Measurement Vibro Metra Hand is applied for measuring human hand-arm vibrations. Hand-arm vibrations are caused by vibrations or shocks which are transmitted by tools, machines and vehicles in the workplace via inner hand and fingers. If a person is exposed to strong hand-arm vibrations, safety and health are endangered and there is an increasing risk of bone, joint and muscle diseases. The "vibration directive” (directive 2002/44/EC) defines minimum requirements for the protection against risks arising from hand-arm vibrations. The measurements are based on the international standards ISO 5349 and ISO 8041.