Sensitivity range: 0.3 - 25.0 µm 

The Lasair III Particle Counter sets the standard for portable aerosol particle counters and meets the requirements of ISO 21501-4. 

Lasair® III Aerosol Particle Counter

The Lasair® III Aerosol Particle Counter is designed for cleanroom work with your unique needs in mind. It sets the standard for portable aerosol particle counters in highly regulated environments, so you can make sure your environment is clean. It can be used for routine remote and mobile cleanroom monitoring. We know the requirments and we’ve done the calculations for you; cleanroom certification results are available through a local printout, downloadable via USB in a secure format, or through the use of external software packages, such as DataAnalyst, FacilityNet or FacilityNet Pharma Software. Power is provided to the unit through the use of the on-board, hot-swappable batteries. Power can also be provided through the use of an external AC power source, which can simultaneously power the unit and charge the on-board batteries. The Lasair III Particle Counter accepts inputs from a wide range of environmental sensors through the four built-in 4-20 mA inputs. Wireless network communications are made easy with an externally mounted wireless adapter, simplifying communications with network systems. The unit can be remotely managed via the built-in Web browser function or through ethernet to FacilityNet Pharma, FacilityNet, or FacilityPro and DataAnalyst Software.

Read more



  • 100 LPM, 50 LPM, or 1 CFM flow rates available
  • 100 LPM flow samples 1 m3 in 10 minutes
  • ISO 21501-4 compliant with a built-in pulse height analyzer (PHA)
  • Large, IR touchscreen can be used when wearing gloves
  • Calculates and creates reports
  • Access via a Web browser
  • Compatible with common cleanroom-cleaning chemicals
  • Available with 12 languages


  • Comprehensive validation manual makes it easy to meet pharmaceutical regulatory requirements
  • Operates in cleanrooms via a web browser: Set up, sample, display, print, download data
  • Removable batteries with optional external charger for continuous mobile use
  • Stores sampling recipes to reduce operator errors
  • Long-term data archiving with DataAnalyst software
  • Local printout for immediate hardcopy results
  • USB electronic printouts for long term storage
  • CSV file download for easy data integration
  • Interactive software steps the user through the ISO 14644-1, EC GMP Annex 1, China GMP and FS 209E room certification process
  • Large IR touchscreen for simplified use
  • Quiet pump improves work environment


  • Cleanroom monitoring
  • Facility certification for ISO, EC GMP, China GMP, FS 209E
  • Trend analysis
  • Statistical process control
  • Troubleshooting particle excursions
  • Manifold compatible
  • Portable or dedicated use

Supporting Materials

Refer to “Instructions for Programming Recipes and Assigning Locations” for instructions on how to program a recipe and assign it to a location using the Lasair® III Aerosol Particle Counter. Part numbers 1000000975 (cleanroom paper) and 1000009974 (thermal paper) can be used for the Lasair® III Aerosol Particle Counter.

Available Accessories

Printer Paper

Printer Paper

Printer Paper is for use with standard printers, as well as for cleanroom-appropriate devices.

Spare Lithium Battery

Spare Lithium Battery

The Spare Lithium Battery is to keep on hand for replacement power as needed. Also available as a four-pack.

Facility Net Software

Facility Net Software

Facility Net Software provides a solution for comprehensive environmental monitoring, including a real-time and historical data display. Compatible Particle Measuring Systems particle counters and molecular contamination monitors, as well as various third-party products.

High-Pressure Diffuser (0.1 CFM)

High-Pressure Diffuser (0.1 CFM)

The High-Pressure Diffuser lets you count particles in high-pressure gas lines by taking gas at pressures between 40 and 100psi and reducing it to a level acceptable to particle counters designed for atmospheric pressure.

Related Products

Nano-ID® NPC10 Nano Air Particle Counter

The Nano-ID NPC10 Particle Counter is the first condensation particle counter specifically developed for ultra-clean manufacturing...

Lasair® III 110 Air Particle Counter

The Lasair III 110 Air Particle Counter is a laser diode-based true 0.100μm particle counter with 1.00 CFM flow rate that doesn't negatively...

Still have Questions?

Our customer support is ready to answer your questions or get a quote ready for you.

Contact Customer Support Download Spec Sheet