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Handheld Particle Counter Model P311

Product SKU: P311

Quick Overview

Handheld Particle Counter

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

Technical Specifications
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