Amazon.com: Triplett EPC175 Particle Counter and Air Quality Meter, Displays Air Temperature, Relative Humidity, Formaldehyde (HCHO) and TVOCs : Automotive
Extech Instruments VPC300 Video Particle Counter with Built-in Camera: Amazon.com: Industrial & Scientific
CEM DT-9850M Particle Counter Dust Monitor Professional Cleanroom Tester Laser Air Detector Data Logger PM2.5 PM10 with 2.8" Color TFT LCD Display Channel 0.3,2.5,10μm Temperature Humidity Measure: Amazon.com: Industrial & Scientific