804 Four Channel Handheld Particle Counter

Product Image of 804 Four Channel Handheld Particle Counter

Accurate - Reliable – Affordable

Seven Sizes: 0.3, 0.5, 0.7, 1.0, 2.5, 5.0 or 10.0 microns

Met One's 804 handheld particle counter is a 4 channel portable particle counter that counts particles 0.3 microns to 10.0 microns, giving you portability and realiability at a low price. 

Completely Self-Contained - Selectable Particle Sizes

Don't let the size fool you! This unit is completely self-contained with its own internal battery and sample pump, and is programmable, allowing you to choose your particle sizes of interest from seven sizes: 0.3, 0.5, 0.7, 1.0, 2.5, 5.0 or 10.0 microns.

Fast Sampling

Unlike other counters that can take up to a minute to deliver results, the 804 incorporates user selectable samplint time up to 1 minute and displays counts in as little as 3 seconds. The unit will take single or continuous samples.

Simple Operation

Only two front-panel buttons and scroll wheel provide a user friendly, menu driven platform that provides ease in configuration.

Battery or AC Powered

The self-contained battery pack powers the unit for 30 hours of typical intermittent operation, and for up to 8 hours of continuous use. The included aC charger/adapter operates the counter, even when the battery pack is discharged, and recharges the depleted battery in 2.5 hours.

Flexible Data Interfaces / USB Communication

Stores up to 2500 records for output, Excel formatted ouput via included single computer software. USB interface provides quick data download and field firmware upgrades.


  • Industrial/Occupational Hygiene
  • Process Control
  • Indoor/Outdoor Air Quality
  • Process Control
  • HVAC Applications
  • Filter Testing
  • Laboratory Environments
  • Trace Contaimination Source
  • QA Programs

Specifications 804

Operating Principle             Counts individual particles using scattered laser light


Sample Duration                  1 minute

Data storage                        2,500 records

Display                                 2-line by 16-character LCD

Controls                               2 button keypad with rotary dial


PM Ranges                          Four Channels: >0.3, >0.5, >0.7, >1., >2.5, >5.0, and >10.0 µm (selectable)

Concentration Range        0 – 3,000,000 particles per cubit foot (105,900 particles/L)

Sensitivity                            0.3 µm

Accuracy                             ± 10% to calibration aerosol

Flow rate                             0.1 CFM (2.83 lpm)

Sample Time                      Adjustable (3 - 60 seconds)

Status Indicators                Low Battery, Service


Light Source                        Laser Diode, 780 nm, 30 mW

Power                                  7.2V Lithium Ion self-contained battery pack.

AC Adapter/Charger         AC to DC module, 100 – 240 VAC to 8.4 VDC

Battery Type                        Li-ion rechargeable Battery 

Battery Operating Time      8 hours continuous operation, 30 hour intermittent operation 

Battery Recharge Time      2.5 hours typical 

Communication                  USB 


Size Height:                         6.75” (17.2 cm) Width: 3.75” (9.5 cm)

Thickness:                           2.0” (5.1 cm)

Weight                                 1.31 lbs – 21 ounces – (0.60 kg)


Operating Temperature       0º C to +50º C 

Storage Temperature          -20º C to +60º C


Supplied                              AC to DC Converter Module with IEC AC Power Cord

                                               USB Cable

                                               Operation manual


                                               NIST Traceable Calibration Certificate

Optional                                Carrying Case (P/N 8517)

                                               Protective Boot (P/N 80450)

                                               Zero Filter Kit (P/N 80846)

                                               Flow Meter Kit (P/N 80530)

804 Four Channel Handheld Particle Counter
Item # MOI804 

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