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Description
Reed Instruments Indoor Air Quality Meter R9905This data logging Indoor Air Quality (IAQ) Meter has the ability to record samples on internal memory and keep track of registered readings with a time and date stamp. The R9905 features a Nondispersive Infrared (NDIR) CO2 sensor for stable, accurate readings and the option to track live measurements via software. Features Triple LCD display simultaneously monitors carbon dioxide (CO2), temperature and relative humidity Calculates time weighted
This data logging Indoor Air Quality (IAQ) Meter has the ability to record samples on internal memory and keep track of registered readings with a time and date stamp. The R9905 features a Nondispersive Infrared (NDIR) CO2 sensor for stable, accurate readings and the option to track live measurements via software.
Features
- Triple LCD display simultaneously monitors carbon dioxide (CO2), temperature and relative humidity
- Calculates time-weighted average (TWA) and short-term exposure limit (STEL)
- Low-drift NDIR CO2 sensor for stable and accurate readings
- Temperature and relative humidity measurements help determine thermal comfort
- Easy-to-read backlit LCD display
- User adjustable audible alarm
- Data hold, Max/Min and Average functions
- Record up to 32,000 datapoints and keep track with internal time and date stamp
- User selectable sampling rate from 1 to 60 mins
- Low battery indicator and auto shut-off
Specifications
| 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: ±(150ppm +5% rdg.) |
| Resolution | 1ppm |
| Warm-up Time | 20s |
| Sampling Rate | 2s |
| General Specifications | |
| Display | LCD |
| Backlit Display | Yes |
| Data Hold | Yes |
| Min, Max, Avg Functions | Yes |
| CO2 Short Term Exposure Limit (STEL) | Yes (15 mins) |
| 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) |
Included Items
- Indoor Air Quality Meter
- USB Cable
- Hard Carrying Case
- Batteries
Applications
- Environmental monitoring in buildings, schools, hospitals and factories
- Verify HVAC/R system installation and system performance
- Manufacturing processes where high CO2 concentrations must be measured, such as fire extinguishers, wine, soda and sugar industries
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.6 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 4
Good history, but not fun, engaging in popular literature.
Format: Paperback
The author is a very competent historian, and proves her points. She does so by stating each thesis and then reciting an exceedingly long string of supporting examples. Rinse and repeat. This is high quality, academic style history, but it’s not very engaging as popular literature. No one’s going to say “I couldn’t put it down.” That being said - I liked it! I learned a lot. Thanks.
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Reviewed in the United States on March 1, 2023
★★★★★ 5
Should be required
Format: Paperback
In my opinion, this book should be required reading in high school/college history classes. It’s so important to learn accurate history when it comes to slavery and this book does that. White women played a larger role than we are taught. Please give this a read!
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Reviewed in the United States on October 23, 2025
★★★★★ 5
No regets
Format: Paperback
This was a good book to read! In school you only learn the male prospective during slavery! I know feel I can say white woman played a major role during slavery times. I like that fact that the Author put in the information to where we can go srwcah and read for ourselves. The visuals where an added touch. I feel like because alot of women of that time couldn't write so alot of information was missing. I feel like this is a must read.
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Reviewed in the United States on April 9, 2025
★★★★★ 5
One of the most poignant books I have read in a long time.
Format: Paperback
One of the most poignant books I have read in a long time.
“Southern communities, lawmakers, and courts recognized slave-owning women as individuals able to acquire and exercise mastery over enslaved people, s is evident from laws passed throughout the South. Laws dating back to the colonial period routinely recognized the mistresses owned enslaved people in their own right, and these same laws acknowledged the fact that these women were capable of exercising mastery over the enslaved people they owned.” Stephanie E. Jones - Rogers.
They were referred to as Southern Belles’. Revered for their ladylike daintiness. But… there was nothing dainty about their dealings for they too, owned human property. These white southern mistresses were heavily involved and often owned more property than their male counterparts even being the breadwinners. These women were barbaric and wore the crown of cruelty.
Dr. Rogers gave the enslaved a voice in this text – allowing our ancestors to share with us their story and experiences under the thumb of white mistresses. This text uncovers the extent of the involvement that white women had with slave ownership. There was discord in marriages due to white women struggles to maintain control of their financial gains of human property. These women utilized the judicial system to protect their pecuniary interests. The parents of these white girls/women bequeathed slaves to white females i.e. as young as newborns – which leads us to mistresses in the making – that is the education of young white women of the mastery of slave ownership. My heart broke as I was able to envision the accounts of atrocities inflicted upon our ancestors. Our people were raped and forced into being breeders and wet nurses to ensure the livelihood of these white mistresses and their families. The evidence is insurmountable in all the ways slave-owning women invested in, and profited from their financial ties to American slavery and its marketplace. Most importantly, there was testimony from formerly enslaved people of their experiences within slavery. This text is a mandatory read for all and in my opinion, must be included as part of the curriculum in schools.
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Reviewed in the United States on October 16, 2020
★★★★★ 5
Slave Trade was not only a White Man's Affair
Format: Kindle
The book is an excellent read particularly in today's climate. Why 53% of white women would put a vile man in office is explained in the pages of this book. White women held positions of power in the America slave trade, a fact overlooked in history. These southern bell's represented as the gold standard of woman hood in the antebellum south were anything but, and they for the most part showed as much, business savvy as down right cruelty in the slave trade. They benefited in every conceivable way from this free labor market. They were no advocates for the kind humane treatment of slaves. In many cases they were as vicious as their counterpart and just as committed to a keeping Blacks marred in the system of bondage. They are in most cases depicted as silent partners and where that might be the case many white women had full command and knowledge of the value of a slave they invested in and they wanted a hefty return. In fact they used every means on the table to keep these black, men, women and children bound to their wealth creation. These co-conspirators had more than a hand in the cookie jar, they enjoyed the power and did not hesitate to support the maintenance of this inhumane institution.
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Reviewed in the United States on April 24, 2019