- 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
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