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Extech
Extech CO250 Indoor Air Quality CO2 Meter
Quote on request
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Portable IAQ; CO₂ 0–5000 ppm; Temp/RH; TWA/STEL; NDIR. RFQ + selection help.
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Key parameters
Measuring range
CO2 0–5,000 ppm; temperature 14–140°F (−10 to 60°C); humidity 0.0–99.9% RH; dew point and wet bulb calculated
Supply
4 × AA (1.5 V) batteries
Approvals
CE
Sensor type
Maintenance-free NDIR CO2 sensor
Notes
Optional RH300-CAL 33%/75% RH calibration bottles
Resolution
CO2 1 ppm; temperature 0.1°F/°C; humidity 0.1% RH
Fits indoor air quality surveys where you need an Extech CO250 measuring CO₂ to 5,000 ppm plus temperature and humidity, with TWA/STEL averages and a maintenance-free NDIR sensor.
Key advantages
- CO₂ — 0 to 5,000 ppm; 1 ppm resolution; NDIR sensor
- Temp / RH — −10…60 °C; 0.0…99.9% RH
- Averages — TWA (8 h) and STEL (15 min)
- Extras — Dew point; wet bulb; programmable audible alarm; PC software/cable
- Kit — 4× AAA; carrying case; CE; 2-year warranty
Typical applications
- IAQ CO₂ compliance checks.
- Office/school ventilation surveys.
- Logged Temp/RH/CO₂ with PC software.
Selection guide
- Alarm setpoints — CO₂ thresholds
- TWA/STEL — Exposure averaging need
- Software — PC documentation
- Power — AAA field life
Common mistakes
- Using outdoors as ambient EPA reference.
- Ignoring warm-up for NDIR.
- Leaving alarm disabled in occupied spaces.
When to RFQ / what to tell us
- Software/cable needs; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 30236 |
| Brand | Extech |
| Model | CO250 |
| Product type | Air Quality Meter |
| CO2 range | 0 to 5,000 ppm |
| CO2 resolution | 1 ppm |
| Sensor | Maintenance-free NDIR CO₂ sensor |
| Temperature | −10 to 60 °C (14 to 140 °F) |
| Humidity | 0.0 to 99.9% RH |
| Functions | TWA (8 h) and STEL (15 min); dew point; wet bulb; user-programmable audible alarm; PC data acquisition software |
| Dimensions | 200 × 70 × 57 mm (7.9 × 2.7 × 2.3 in) |
| Weight | 190 g (6.7 oz) |
| Power | 4× AAA (1.5 V) |
| Certifications | CE |
| Warranty | 2 years |
Documents
FAQ
Q: CO₂ range? A: 0 to 5,000 ppm.
Q: TWA/STEL? A: Yes — 8 h TWA and 15 min STEL averages.
Q: What should I send for a quote? A: Accessories, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | CO2 0–5,000 ppm; temperature 14–140°F (−10 to 60°C); humidity 0.0–99.9% RH; dew point and wet bulb calculated |
| Supply | 4 × AA (1.5 V) batteries |
| Approvals | CE |
| Sensor type | Maintenance-free NDIR CO2 sensor |
| Notes | Optional RH300-CAL 33%/75% RH calibration bottles |
| Resolution | CO2 1 ppm; temperature 0.1°F/°C; humidity 0.1% RH |
| Functions | TWA (8 h) and STEL (15 min) weighted averages; user-programmable audible alarm; backlit triple LCD; RS-232 PC datalogging |
| Dimensions | 7.9 × 2.7 × 2.3 in (200 × 70 × 57 mm) |
| Weight | 6.7 oz (190 g) |
| Warranty | 2 years |