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Detect discrete particles using a laser-based sensor. Weighs only 1.5 pounds. Internal rechargeable batteries last for 8 hours. The 228 displays the concentration in particles per cubic foot or particles per liter after a six-second sample. The 229 monitors total particle count after a one minute sample.
| Measurement Type | Count |
| Sample Type | Aerosol Droplets (Liquid in Gas) |
| Performance Specifications | |
| Measuring Range | 0.3000 to ? µm |
| Technology | Light or Laser Blockage |
| Display & Special Features |