A professional who operates sound-testing equipment to detect defects in machinery ball bearing assemblies and diagnoses causes of defects. Responsibilities include:

• Turns dials on equipment to specified setting.
• Slides bearing on adapter arm and starts machine to rotate inner ring of bearing.
• Listens through headphones to detect sounds that indicate mechanical defect in bearing and to determine probable cause of defect.
• Separates defective bearings and sorts bearings for scrap or salvage.