What is Hand - Arm Vibration (HAV)?. HAV occurs when the hands and arms are exposed to vibration. Sources of vibration may include hand-held power tools or guiding materials, by hand, into a machine for processing. . WARNING: If you are regularly and frequently exposed to high levels of vibration through your hands from equipment, tools or materials you are working with, you may be at risk of permanent damage to your hands and arms..
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