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Extech CO250
Extech CO250 Portable Air Quality CO2 Meter with Datalogger | CO2 0-5000 ppm, NDIR, temp, humidity, dew point, wet bulb, 99-record logger, backlit LCD, 4 AA, case
Only 9 left in stock - order soon.
A handheld professional meter with an NDIR sensor (0–5000 ppm), 1-second sampling, temperature, humidity, dew point and wet bulb on a backlit triple LCD. It stores 99 records, has an 80 dB adjustable alarm, tied for the loudest listed, and runs about 24 hours on 4 AA batteries or a 9V adapter. Premium-priced with a smaller range than the Amprobe CO2-100, it suits inspection-style spot checks.
- Price
- $483.47
- Brand
- Extech
Prices from Amazon as of . Product prices and availability are accurate as of the date and time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of the product. As an Amazon Associate I earn from qualifying purchases.
How it compares
Compared with the other carbon dioxide detectors on this site that list each value:
- Sampling interval 1 s: lower than 71% of 7 others
- Length 7.90 in.: higher than 88% of 18 others
- Length 200 mm: higher than 88% of 18 others
- Depth/Height 2.30 in.: higher than 72% of 18 others
Specifications
These details are subject to change and may not be current. Please check Amazon or manufacturer web site to confirm before purchase.
Detection capabilities
- Gases detected
- CO2
- Max. CO2 detection
- 5,000 ppm
- Min. CO2 detection
- 0 ppm
- Accuracy
- ±(5% rdg + 50 ppm)
- Resolution
- 1 ppm
- Sampling interval
- 1 s
- Temperature & humidity readout
- Yes
- Sensor type
- NDIR
- Calibration method
- Factory calibrated to 400 ppm; manual calibration in 400 ppm chamber
Alarms
- Alarm loudness
- 80 dB
- Adjustable alarm levels
- Yes
- Alarm types
- Audible
Physical Attributes
- Weight
- 0.42 lbs
- Weight
- 0.19 kg
- Length
- 7.90 in.
- Length
- 200 mm
- Width
- 2.70 in.
- Width
- 70 mm
- Depth/Height
- 2.30 in.
- Depth/Height
- 57 mm
- Display type
- Triple backlit LCD
Power
- Power sources
- 4 AA batteries, 9V AC adapter
Charging
- Battery runtime
- 24 hours
Operating Temp Range
- Operating temp min
- 32 ℉
- Operating temp max
- 122 ℉
- Operating temp min
- 0 ℃
- Operating temp max
- 50 ℃
- Max operating humidity
- 95 % RH
Certifications
- Certifications summary
- CE
- CE marked
- Yes
More specifications
- Warranty
- 2 Years
Features
- Accurate CO₂ Monitoring - Measures carbon dioxide levels from 0 to 5,000 ppm using an advanced NDIR sensor for reliable indoor air quality testing
- Multi-Parameter Measurement - Simultaneously tracks temperature, humidity, dew point, and wet bulb for complete indoor environmental assessment
- Portable & User-Friendly Design - Compact handheld unit with large backlit LCD and intuitive keypad makes it easy for field technicians, inspectors, and HVAC professionals
- 99-Record Data Storage - Built-in datalogger stores up to 99 sets of readings, ideal for trend monitoring, workplace safety checks, and compliance reporting
- Versatile Applications - Perfect for offices, classrooms, laboratories, factories, greenhouses, and HVAC inspections where indoor air quality is critical
Similar products from other brands
Chosen for their similar specifications and price.
 This productExtech CO250 |
 Amprobe CO2-100 |
 Temtop M2000 2nd Generation |
 Inkbird IAM-T1 |
|
|---|---|---|---|---|
| Price | $483.47 | $477.16 | $209.99 | $129.99 |
| Model | CO250 | CO2-100 | M2000 2nd Generation | IAM-T1 |
| Gases detected | CO2 | CO2 | CO2 and formaldehyde (HCHO) | CO2 |
| Max. CO2 detection (ppm) | 5,000 | 9,999 | 5,000 | 9,999 |
| Min. CO2 detection (ppm) | 0 | 0 | 0 | 0 |
| Accuracy | ±(5% rdg + 50 ppm) | ±30 ppm ±5% of reading | ±50 ppm + 5% of reading | ±(30 ppm + 3% of reading) |
| Resolution (ppm) | 1 | 1 | 1 | 1 |
| Response time (T90) (s) | – | 30 | – | – |
| Sampling interval (s) | 1 | 1 | – | 60 |
| Temperature & humidity readout | Yes | Yes | Yes | Yes |
| Sensor type | NDIR | NDIR | NDIR | NDIR (Senseair) |
| Calibration method | Factory calibrated to 400 ppm; manual calibration in 400 ppm chamber | Manual fresh-air calibration (400 ppm default) | – | Built-in auto-calibration; manual calibration via app |
| Data logging | – | – | Yes | Yes |
| High alarm level (ppm) | – | – | – | 1,400 |
| Alarm loudness (dB) | 80 | 80 | – | – |
| Adjustable alarm levels | Yes | Yes | Yes | Yes |
| Alarm types | Audible | Audible beeper | – | Buzzer sound and on-screen alarm |
| Weight (lbs) | 0.42 | 0.40 | 0.50 | 0.30 |
| Weight (kg) | 0.19 | 0.18 | 0.23 | 0.14 |
| Length (in.) | 7.90 | 8.27 | 8.80 | 2.95 |
| Length (mm) | 200 | 210 | 224 | 75 |
| Width (in.) | 2.70 | 2.76 | 2.80 | 3.15 |
| Width (mm) | 70 | 70 | 74 | 80 |
| Depth/Height (in.) | 2.30 | 2.28 | 1.40 | 1.30 |
| Depth/Height (mm) | 57 | 58 | 38 | 33 |
| Display type | Triple backlit LCD | Backlit LCD, triple display | TFT color screen | 2.13-inch electronic ink (e-ink) display |
| Power sources | 4 AA batteries, 9V AC adapter | 4 AA batteries or 9V/1A DC adapter | – | 2 x AA batteries |
| DC input voltage | – | 9V | 5V | 3V |
| Charging port | – | – | USB | – |
| Battery runtime (hours) | 24 | – | 8 | – |
| Battery capacity (mAh) | – | – | 3,000 | – |
| Battery chemistry | – | – | – | Alkaline (2 x AA) |
| Operating temp min (℉) | 32 | 32 | 32 | 32 |
| Operating temp max (℉) | 122 | 122 | 122 | 122 |
| Operating temp min (℃) | 0 | 0 | 0 | 0 |
| Operating temp max (℃) | 50 | 50 | 50 | 50 |
| Max operating humidity (% RH) | 95 | 95 | 90 | – |
| Certifications summary | CE | CE marking, conforms to EN61326-1 (EMC) | – | FCC Part 15 Class B statement |
| FCC Part 15 compliant | – | – | – | Yes |
| CE marked | Yes | Yes | – | – |
| Warranty | 2 Years | 1 Year | 1 Year | 1 Year |
Data sources
Data for this product compiled from these sources:
Specifications last updated Oct 20, 2026.