Gas Detectors arrow TES Air Quality Monitor / Particle Counter

Air Quality Monitor / Particle Counter

Part#: 5321
Supplier: TES
Calibration Certificate: is available at extra cost
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The meter is a real-time air quality monitor instrument used to monitor the concentration of PM2.5, humidity and temperature in the indoor environment.


  • Fine particulate matter (PM2.5) measurement
  • Temperature and Humidity measurements.
  • Health index (0 ~ 9) detection and alarm.
  • PM2.5 time weighted average reading.
  • Data hold and MAX/MIN with time stamp function.
  • Six-color LED indication Air Quality Index Category (good, medium, low)
  • Preset warning point of buzzer alarm, LED and alarm output.
  • Manual data memory and read function.



  • Measurement Range:
    PM2.5 : 0 to 500µg/m3
    Humidity : 1% to 99%R.H.
    Temperature : -20℃ to +60℃ (-4℉ to +140℉)
  • Resolution: 0.1µg/m3, 1ppm, 0.1% R.H., 0.1℃, 0.1℉
  • Accuracy:
    PM2.5 : ±10% of reading±10µg
    Temperature : ±0.8℃, ±1.5℉
    Humidity : ±3%RH (at 25℃, 30 to 80% RH) or ±5%RH (at 25℃, 0 to 20% RH and 80 to 100% RH).
  • Sensor type:
    PM2.5: Photodiode sensor.
    Humidity: Precision capacitance sensor
    Temperature: Thermistor sensor
  • Response time
    Humidity : 45%R.H. to 95% R.H. <= 1min or 95%R.H. to 45%R.H. <= 3min
    Temperature : 10℃/2 sec.
  • Sampling rate: 1 sample/second.
  • Data Memory Capacity: 39 sets. (Direct reading from LCD display)
  • Operating temperature and humidity: 0℃ to 60℃, below 95% R.H.
  • Storage temperature and humidity: -10℃ to 60, below 70% R.H.
  • Power supply: Four 1.5V LR-6/AA size batteries, AC adapter
  • Battery life Approx. 8 hour
  • Dimensions 165mm(L)×93mm(W)×75mm(T) , (6.5”L×3.7”W×3”T)
  • Weight Approx. 380g (13.4oz)



Need to have this new TES 5321 Air Quality Monitor / Particle Counter calibrated? While this gauge has passed a quality control check, having a calibration certificate for gas detectors might be required by your quality control system. Digital Measurement Metrology (owner of is a canadian metrology company with more than 25 years of experience. Our Brampton, Ontario based calibration lab has one of the most comprehensive ISO 17025 accredited calibration scope in Canada.

Do you have an old TES gauge to be calibrated? We might be able to calibrate TES gas detectors (TES 5321 or a different model) and provide an ISO, NIST traceable calibration certificate. Please contact our metrology lab for more info.

Ordering info

SKUDescriptionUnitPriceIn Stock
5321TES Air Quality Monitor / Particle Counterpiece 0

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