This industry comprises establishments primarily engaged in performing physical, chemical, and other analytical testing services, such as acoustics or vibration testing, assaying, biological testing (except medical and veterinary), calibration testing, electrical and electronic testing, geotechnical testing, mechanical testing, nondestructive testing, or thermal testing. The testing may occur in a laboratory or on-site.

• Acoustics testing laboratories or services
• Assaying services
• Automobile proving and testing grounds
• Biological (except medical, veterinary) testing laboratories or services
• Calibration and certification testing laboratories or services
• Electrical testing laboratories or services
• Electronic testing laboratories or services
• Environmental testing laboratories or services
• Film badge testing (i.e., radiation testing) laboratories or services
• Fire insurance underwriters' laboratories
• Food testing laboratories or services
• Forensic (except medical) laboratories or services
• Geotechnical testing laboratories or services
• Hydrostatic testing laboratories or services
• Industrial testing laboratories or services
• Laboratory testing (except medical, veterinary) services
• Mechanical testing laboratories or services
• Metallurgical testing laboratories or services
• Non-destructive testing laboratories or services
• Pollution testing (except automotive emissions testing) services
• Product testing laboratories or services
• Radiation dosimetry (i.e., radiation testing) laboratories or services
• Radiation testing laboratories or services
• Radiographic testing laboratories or services
• Radiographing welded joints on pipes and fittings
• Radiography inspection services
• Radon testing laboratories or services
• Seed testing laboratories or services
• Soil testing laboratories or services
• Testing laboratories (except medical, veterinary)
• Thermal testing laboratories or services
• Vibration testing laboratories or services
• X-ray inspection services