9 Instruments for the Physical and Chemical Detection and Analysis of Materials-Namely, Refractometers, Moisture Analyzers, Infrared Analyzers, Analytical Photometers, Thermal Conductivity Analyzers, Suspended Solids Monitors, Collectors for Sampling, Mass Spectrometers, Residual Gas Analyzers, Ultraviolet Analyzers, Oxygen Analyzers, and Dust Monitors