Aerosol and gas sampling and monitoring samplers and collectors, namely, air and gas samplers for particle collection instrumentation for monitoring and collecting particulate or biological samples in air or gas, including source air or gas sampling machines and portable air orgas samplers for monitoring the quality of air samples, collection of particle or biological samples, or monitoring and collection of particle or biological samples in air or gas for analysis; none of the aforesaid bein...

air sampling equipment, namely source air sampling machines for monitoring the quality of air samples