REED 77535 Indoor Air Quality Meter

 Features:                              

• Simultaneously monitors carbon dioxide (CO2), relative humidity and temperature
• Instantaneous readings are displayed on a high resolution LCD with backlight
• Dew point and wet bulb temperatures can also be displayed
• Displays STEL readings (Short-term exposure limit) over a 15-minute period and TWA readings (Time-weighted average) over a period of 8 hours
• Hold function freezes displayed reading
• Maximum, minimum and average functions
• Low drift, non-dispersive infrared CO2 sensor
• Audible warning alarm of excessive CO2 concentrations
• RS-232 serial interface

Specifications:

• Ranges: CO2: 0 to 5,000 ppm;
  Temperature: -10 to 60°C (14 to 140°F);
  Humidity: 0 to 99.9% RH;
  Dew Point: -73.4 to 60°C;
  Wet Bulb: -13.3 to 60°C
• Resolution: CO2: 1 ppm;
  Temperature: 0.1°C/°F;
  Humidity: 0.1% RH
• Accuracy: CO2: ±5% rdg. ±50 ppm;
  Temperature: ±0.6°C (±0.9°F);
  Humidity: ±3% RH @ 25°C (10 to 90% RH)
       ±5% RH <10% & >90%
• Sensors: CO2: Non-Dispersive Infrared (NDIR);
  Humidity: Rotronic capacitor
• Response Time: 30 seconds
• Alarms: Audible: 80dB
• Power Supply: 4 x "AA" alkaline batteries
• Battery Life: 24 hours