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Benchtop Particle Counter BT-645

Met One Instruments’ BT‐645 Benchtop Particle Counter has been designed to continuously measure and record particulate information for indoor work place and public space environments. Our BT-645 optical sensor, matched electronics and backlit display, are enclosed in a rugged metal enclosure to protect the instrument during normal daily use.

Operations / Interface

The BT-645 laser optical sensor is used to detect and measure particulate concentrations up to 100 milligrams per cubic meter. The continuous flow optical sensor is combined with purge air to ensure accurate measurements in adverse environments. The internal datalogger will store over 28,000 samples. Sample history events can be viewed on the display or downloaded to a computer using Comet software. The BT-645 internal battery pack provides over 10 hours of continuous operation. Battery recharge time is approximately 2.5 hours. The standard unit is supplied with a TSP inlet. Optional sampling inlets are available for PM1, PM2.5, and PM10


  • Four Mass Ranges (PM1, PM2.5, PM10 & TSP)
  • Rugged Design
  • Real Time Monitoring
  • Sample History
  • Low Cost w/ Data Logging
  • Purge Air System
  • 1-Year Warranty



User Manual
USB Cable
Communications Software (Comet)
AC Adapter / Battery Charger
NIST Certificate of Calibration


PM1 Sharp Cut Cyclone (P/N SCC-111)
PM2.5 Sharp Cut Cyclone (P/N SCC‐112)
PM10 Sharp Cut Cyclone (P/N SCC‐110)
Custom Serial Cable (P/N 3228)


Specifications are subject to change at any time.
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