REED Instruments R9900-NIST AIR QUALITY METER W/NIST CERT

REED Instruments R9900-NIST AIR QUALITY METER W/NIST CERT Measures carbon dioxide (CO2), temperature, humidity and automatically calculates dew point and wet bulb temperatures. REED R9900 Offers This IAQ (indoor air quality) meter simultaneously monitors carbon dioxide, relative humidity, and temperature. The R9900 is capable of automatically calculating wet bulb and dew point temperatures as well as statistical TWA and STEL averages. Features Triple LCD display simultaneously monitors carbon dioxide (CO2), relative humidity and temperature Automatically calculates dew point and wet bulb Calculates statistical weighted averages of TWA (8 hour time weighted average) and STEL (15 minute short term exposure limit) User adjustable audible alarm Data hold, Max/Min and average functions Low battery indicator and auto shut off [custom1] REED R9900 Specifications Temperature Measuring Ranges 14 to 140°F (-10 to 60°C) Accuracy ±0.9°F (±0.6°C) Resolution 0.1°F/°C Humidity Measuring Range 0 to 99.9% RH Accuracy ±3% (10 to 90% RH) ±5% (90% RH) Resolution 0.1% RH CO2 (Carbon Dioxide) Measuring Range 0 to 5,000 ppm Accuracy < 999 ppm: ±40 ppm>1,000 ppm: ±5% Rdg  Resolution 1 ppm General Specifications Response Time 1 sec Display Triple LCD display Backlit Display Yes Dew Point / Wet Bulb Calculation Yes Data Hold Yes Min, Max and Avg Functions Yes CO2 Short Term Exposure Limit (STEL) Yes (15 mins) CO2 Time Weighted Average (TWA) Yes (8 hours) Alarm Yes (audible) Auto Shut-off Yes (after 20 mins/off) Low Battery Indicator Yes Power Supply 4 AA Batteries Battery Life Approx. 24 hours (continuous use) Product Certifications CE Operating Temperature 14 to 122°F (-10 to 50°C) Storage Temperature 14 to 140°F (-10 to 60°C) Operating Humidity Range 10 to 85% Dimensions 7.9 x 2.7 x 2.3" (200 x 70 x 57 mm) Weight 6.7 oz (190g) [/custom1]