TRIPLETT GSM400 CO2 Temperature and Humidity Meter
The TRIPLETT GSM400 measures airborne carbon dioxide together with temperature and humidity, displaying the values simultaneously for indoor-condition checks. NDIR sensing, adjustable warning levels and time-weighted indications support a defined monitoring routine.
Key Features
- Backlit triple indication of CO 2, temperature and humidity.
- 8-hour TWA and 15-minute STEL indications.
- Reading hold and minimum/maximum values.
- Dew point and wet-bulb calculations with adjustable CO 2 warning level.
Technical Specifications
| CO2 range | 0–9999 ppm |
| CO2 accuracy within0–5000ppm | ±(5% + 30 ppm) |
| Temperature range | −10–60 °C |
| Temperature accuracy | ±0.6 °C |
| Relative humidity | 0–99.9% RH |
| Humidity accuracy within10–90%RH | ±3% RH |
| CO2 alarm setting | 100–9900 ppm; 100 ppm steps |
| Power | 4 × AA batteries |
Package Contents
GSM400 meter, four AA batteries and carrying case.
Suitable Applications
Compare indoor conditions in offices, halls, schools and public facilities, including changes in CO2 with occupancy and operation. Interpret readings alongside ventilation, occupancy distribution and measurement position.
Important Before Purchase
This measures CO2; it is not a carbon monoxide (CO) alarm or multi-gas detector. Follow start-up, conditioning and calibration instructions before relying on readings. A CO2 value alone does not assess every airborne contaminant.
Frequently Asked Questions
Does it measure carbon monoxide? No. The measured gas is carbon dioxide, CO2.
Can temperature and humidity be shown together? Yes, alongside CO2 on the triple display.
Recommended Products
- WADFOW WTM1503 Temperature and Humidity Meter — For separate ambient temperature and humidity checks alongside the inspection readings.
- TRIPLETT EPC175 PM2.5 and PM10 Air Quality Meter — For a separate PM2.5 and PM10 particle check during air quality inspections.
- TRIPLETT SLM400 Sound Level Meter — For comparing noise levels near equipment during workplace inspection rounds.
- JADEVER Infrared Surface Thermometer — For non contact equipment surface temperature comparisons; it measures a surface, not internal sample temperature.
- WISEUP 16 Inch Tool Bag — To organize small inspection tools during transport; check internal dimensions before packing the instrument and accessories.