Met One Instruments, Inc.’s Model GT-324 particle counter is a full-featured handheld particle counter that provides the functionality of a bench unit in a portable package. A fully integrated RH/Temp sensor immediately provides data to your displayed and logged data. A convenient unit for compliance, the user interface is simple with the multifunction rotary dial. Comply with 21 CFR Part 11 using the password feature to prevent unauthorized changes to user settings. Unit is 21501-4 compliant capable. All new units include a NIST traceable certificate of calibration and the upgraded Particle View software package. Particle View now features additional reports, alarms, charts, and conversions for improved data analysis. The 324 has seven selectable sizes; 0.3, 0.5, 0.7, 1.0, 2.5, 5.0, and 10.0 microns, of which the operator can choose any 4 of the particle sizes of interest. The GT-324 is suitable for many applications, including but not limited to Cleanroom Monitoring, Controlled Environments, Filter Testing, Compliance Testing, Process Control, Indoor Air Quality, HVAC Applications, QA Programs, etc.