The Triplett Model GSM400 Indoor Air Quality CO2 Meter measures CO2, Temperature, Humidity, Wet Bulb and Dew Point and can be used to measure air quality in office buildings, schools, exhibition halls, shopping malls, meeting rooms, fitness centers, restaurants and other public places. The meter incorporates NDIR (non-dispersive infrared) waveguide technology and simultaneously displays CO2, Temperature and Relative Humidity on its backlit triple LCD display. It features TWA (Time Weighted Average - 8 hours) and STEL (Short Term Exposure Limit - 15 minute weighted average) measurement with a user-adjustable CO2 alarm level. Additional features include Min/Max to record the highest and lowest readings, Data Hold freezes the reading on the display, and Auto power off with disable to conserve battery life. °F/°C selectable.
Features:
- Measures CO2, Temperature, Humidity, Wet Bulb and Dew Point
- Simultaneously displays CO2, Temperature and Relative Humidity
- TWA (Time Weighted Average - 8 hours)
- STEL (Short Term Exposure Limit - 15 minute weighted average)
- NDIR (non-dispersive infrared) waveguide technology
- Backlit triple LCD display
- Min/Max records the highest and lowest readings
- User-adjustable CO2 alarm level
- Auto power off with disable
- °F/°C selectable
- Includes (4) AA batteries and carrying case
- 1 year warranty
Specifications:
| GSM400 | |
| Carbon Dioxide (CO2) | 0 to 9999ppm |
| Accuracy | ±(5% + 30ppm) (0 to 5000ppm) |
| Air Temperature | 14 to 140°F (-10 to 60°C) |
| Accuracy | ±0.9°F/0.6°C |
| Relative Humidity | 0 to 99.9%RH |
| Accuracy | ±3%RH (10 to 90%RH) |
| Wet Bulb | 23 to 140°F (-5 to 60°C) |
| Dew Point | -4 to 140°F (-20 to 60°C) |
| CO2 Alarm | 100 to 9900ppm in 100ppm steps |
| Power | 4 AA batteries |
| Dimensions | 7.9 x 2.7 x 2.3'' (200 x 70 x 57mm) |
| Weight | 6.7oz (190g) |
US 25340 
BR 21103 
GB 15552 
AU 9876 
CA 9365 
IN 6243 
IE 4760 
NZ 4078 
