A professional who inspects metal phonograph record $T3mothers$T1 for surface defects, using optical and sound-reproducing equipment. Responsibilities include:

• Places matrix on turntable and measures grooved surface and width of grooves in matrix, using ruler and calibrated microscope.
• Places tone arm on matrix and starts sound-reproducing machine.
• Listens for defects in matrix, such as pops and ticks, and observes meter that indicates surface noise and sound level.
• Stops machine and locates defects in matrix, using microscope and magnifying glass.
• Marks location of defects with bar soap and returns matrix for repair.
• Notes reasons for rejection on worksheet.
• Listens to repaired matrices to ensure that defects have been eliminated.