9 Laboratory and scientific equipment in the nature of ductless fume enclosures; biological, pharmaceutical and chemical safety workstations in the nature of self-contained isolation enclosures not for medical purposes for use in analyzing and testing laboratory samples and pharmaceutical compounding; weighing enclosures in the nature of self-contained isolation chambers for non-medical purposes for use in weighing compounds and samples; microscope enclosures in the nature of self-contained isolation chambers for non-medical purposes for use in microscopic viewing and analyzing biological and chemical samples for forensic, laboratory, pharmaceutical and medical research use; ductless fume enclosures and self-contained isolation enclosures not for medical purposes for use in microscopic viewing and analyzing laboratory samples; powder handling enclosures namely, self-contained isolation enclosures not for medical purposes for use in analyzing and testing powder samples for forensic, laboratory and medical research use and for use in pharmaceutical compounding; polymerase chain reaction (PCR) workstations, namely, self-contained isolation enclosures for laboratory purposes and not for medical purposes for use in manipulating and amplifying DNA and RNA samples for forensic, laboratory and medical research use; forensic workstations, namely, self-contained isolation enclosures not for medical purposes for use in analyzing and testing samples for forensic, laboratory and medical research use; ductless fume enclosures and self-contained isolation enclosures not for medical purposes for use in solvent cleaning and metal etching; ductless fume enclosures and self-contained isolation enclosures for laboratory purposes and not for medical purposes for use in tissue staining, biological sample preparation, pathology and molecular biology; airflow control and monitoring devices, namely, electronic sensors for monitoring the air flow through air filters; air filter monitoring devices, namely, electronic sensors for monitoring the air flow through air filters; monitoring devices, namely, electronic sensors for detecting chemicals and gases; monitoring devices, namely, electronic sensors for monitoring temperature and humidity; ductless fume hoods, namely, ductless fume enclosures