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PID (Photo Ionization Detector), used measure volatile organic compounds and other gases in concentrations from parts per billion (ppb) to parts per million (ppm)

PID is a very sensitive instrument used in a wide variety of applications such as:

Hazardous waste sites Clean-up of spills
Protecting workers from toxic vapors Refineries
Leak detection for compliance Pulp and paper plants
Hazardous materials response Terrorist chemical attacks