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Handheld Particle Counter Model P311

Product SKU: P311

Quick Overview

The Handheld Particle Counter – Model P311, available through New Star Environmental is an excellent choice when you’re seeking a user-friendly, reliable handheld particle counter. The features particular to the Model P311 include easy configuration; light weight at only 1.26 lbs. / .57 kg); 3.5" LCD screen displays up to three size channels; 8,000 sample records can be stored, which can then be viewed on the unit itself via a USB cable output. The Model P311 complies with ISO 21501-4. Includes a one-year warranty.

Availability: In stock



The Airy Technology P311 handheld particle counter measures 0.3 µm to 5.0 µm with a flow rate of 0.1 CFM (2.83 LPM). 

Only 1.26 lb (0.57 kg), user-friendly and easy to configure, this handheld particle counter displays up to 3 size channels on its 3.5” LCD display. 

The Airy Technology P311 stores 8,000 sample records that can be viewed on the unit or on a computer via USB cable. The P311 complies with ISO 21501-4 and includes a one year warranty. With excellent quality and reliable performance, the Airy Technology P311 is the best priced handheld particle counter in the market.



  • Measures 0.3 µm to 5.0 µm
  • 0.1 CFM (2.83 LPM) flow rate
  • Measures 3 channels of simultaneous data
  • Weighs only 1.26 lb (0.57 kg)
  • Long life laser diode
  • USB output
  • Removable and rechargeable AA batteries
  • Includes carrying case, battery charger and download software
  • Stores up to 8,000 sample records and 199 sample locations
  • View data recorded on-screen or via computer
  • Large color LCD display
  • Concentration limit of 4,000,000 per ft³
  • Complies with ISO 21501-4 and JIS B9921 standards
  • Lightweight high-impact injection molded plastic enclosure
  • Easy to clean and wipe down
  • Internal audible alarm
  • 1 year limited warranty


Additional Information

Size Range 0.3 to 5.0 μm
Channel Sizes Channel 1: 0.3/0.5 μm; Channel 2: 0.5/1.0/2.0/2.5 μm; Channel 3: 5.0 μm
Counting Efficiency 50% @ 0.3 μm; 100% for particles >0.45 μm per JIS
Concentration Limit 4,000,000 Particles/ft³ @ 5% coincidence loss
Light Source Long Life Laser Diode
Zero Count Level <1 count / 5 minutes (<2 particles / ft³) (per ISO 21501-4 & JIS)
Size Resolution <15% at 0.5 μm (per ISO 21501-4)
Flow Rate 0.1 CFM (2.83 LPM)
Flow Rate Control Automatic flow control
Calibration NIST traceable
Sample Probe/Tubing Isokinetic sampling probe and probe for tubing
Sampling Modes Manual, automatic, ISO¹, cumulative, differential, count/concentration
Sampling Time 1 second to 99 minutes 59 seconds (configurable)
Sampling Frequency 1 to 1,999 cycles or continuous (configurable)
Sample Output Internal HEPA filter
Vacuum Source Internal Pump
Communication Interface USB
Data Storage 8,000 sample records
Display 3.5″ (8.9 cm) 320 x 240 Color LCD
Power DC 5V 1A (Mini USB TYPE-B)
Battery Removable AA Ni-MH
Dimensions (L x W x H) 7” x 3.5” x 1.9” (17.8 cm x 9 cm x 4.7 cm) does not include probes
Weight 1.26 lb (.57 kg)
Standards ISO 21501-4 and JIS B9921
Warranty 1 year limited warranty
Operating Conditions 5° to 35° C 20% to 95%RH non-condensing
Storage Conditions -20° to 50° C 20% Up to 98%RH non-condensing
Accessories Operating manual on CD, AC adapter, isokinetic inlet, USB cable, purge filter, data download software, 4 x AA batteries with charger, calibration certificate, carrying case.
Optional Accessories Barbed fitting hose adapter