W H A T

W H A T is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Hearing & Sound Level Testing Industrial

North American Industry Classification System (NAICS) Categories:

• All Other Miscellaneous Ambulatory Health Care Services > Physical Examinations & Testing Services > Hearing Testing

Standard Industry Classification (SIC) Categories:

• Health And Allied Services, Nec > Physical Examinations & Testing Services > Hearing Testing