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The Reed Instruments R9905 is an IAQ meter with a triple LCD display that simultaneously monitors carbon dioxide (CO2), temperature and relative humidity.
| Temperature | |
| Measuring Range | -4 to 140°F (-20 to 60°C) |
| Accuracy | ±1.5°F (±0.8°C) |
| Resolution | 0.1°F/°C |
| Humidity | |
| Measuring Range | 0 to 100% RH |
| Accuracy | 10 to 90% RH: ±3% <10% & >90% RH: ±5% |
| Resolution | 0.1% RH |
| CO2 (Carbon Dioxide) | |
| Sensor Type | Nondispersive Infrared (NDIR) |
| Measuring Range | 0 to 30,000ppm |
| Accuracy | 0 to 5000ppm: ±(75ppm + 3% rdg.) 5001 to 30,000ppm: ±(150 ppm +5% rdg.) |
| Resolution | 1ppm |
| Warm-up Time | 20 seconds |
| Sampling Rate | 2 seconds |
| General Specifications | |
| Display | LCD |
| Backlit Display | Yes |
| Data Hold | Yes |
| Min, Max, Avg Functions | Yes |
| CO2 Short Term Exposure Limit (STEL) | Yes (15 minutes) |
| CO2 Time Weighted Average (TWA) | Yes (8 hours) |
| Datalogging Capabilities | Yes |
| Real-Time Clock and Date Stamp | Yes |
| Selectable Sampling Rate | Yes (between 1s and 60m59s) |
| Internal Memory | Yes (32,000 datapoints) |
| Alarm | Yes (Low and High) |
| Auto Shut-off | Yes (adjustable) |
| Kick Stand | Yes |
| Low Battery Indicator | Yes |
| Power Supply | 9V battery |
| Battery Life | Approx. 10 hours (continuous use) |
| PC Connectivity | USB |
| Software OS Compatibility | Windows 7/8/10 |
| Product Certifications | CE |
| Operating Temperature | 32 to 122°F (0 to 50°C) |
| Storage Temperature | -4 to 140°F (-20 to 60°C) |
| Operating Humidity Range | 0 to 90% |
| Storage Humidity Range | 10 to 75% |
| Maximum Operating Altitude | 6561' (2000m) |
| Dimensions | 11.2 x 2.6 x 1.5" (284 x 65 x 39mm) |
| Weight | 10.7oz (304g) |
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