Extech CO250 Air Quality Meter

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Extech CO250 Air Quality Meter

This Portable Indoor Air Quality CO2 Meter measures Carbon Dioxide (C02), Temperature, Humidity, Dew Point, and Wet Bulb. Checks for Carbon Dioxide (CO₂) concentrations and calculates statistical weighted averages of TWA (8 hour time weighted average) and STEL (15 minute short term exposure limit). User programmable audible alarm. Data acquisition software and cable included to record and document CO2, Humidity and Temperature data. Complete with software and cable, 4 AA batteries, and carrying case.

Extech CO250 Air Quality Meter is a professional-grade device designed for monitoring indoor air quality by measuring Carbon Dioxide (CO₂), Air Temperature, Humidity, and Dew Point. This meter is ideal for HVAC/Clean Rooms, factories, laboratories, and office environments where precise air monitoring is essential for maintaining healthy air conditions.

Featuring a triple display, the Extech CO250 shows simultaneous readings of CO₂ levels, temperature, and humidity, making it easy to detect poor ventilation or indoor pollution. The device includes a user-programmable alarm to alert when CO₂ concentration exceeds set limits, ensuring a safe and comfortable indoor atmosphere. Its built-in non-dispersive infrared (NDIR) sensor provides long-term stable CO₂ measurement, while the data hold and min/max functions enhance usability in field testing and industrial applications.

The Extech CO250 also includes a USB interface for data logging, making it suitable for environmental analysis and air quality documentation. Designed for both professionals and facility managers, this portable air quality meter is a reliable choice for maintaining proper ventilation, especially in enclosed areas.

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Key Features

Multi-parameter measurement: The CO250 measures carbon dioxide (CO₂), ambient temperature, relative humidity, as well as calculates dew point and wet-bulb temperature.
CO₂ Range & sensor tech: Measures CO₂ from 0 to 5,000 ppm (resolution 1 ppm) using a maintenance–free NDIR (non-dispersive infrared) sensor for dependable readings without frequent replacement.
Temperature & Humidity Ranges
- Temperature: –10 °C to +60 °C (14 to 140 °F), resolution 0.1 °C/°F.
- Relative Humidity (RH): 0.0 % to 99.9 % RH, resolution 0.1 %. i
Time-Weighted Averages: Computes TWA (8-hour time-weighted average) and STEL (15-minute short-term exposure limit) for CO₂ — helpful for occupational exposure or ventilation-assessment projects.
User-programmable audible alarm: You can set alarm thresholds (for example, CO₂ exceeding a defined ppm) — useful for alerting when ventilation is needed or IAQ thresholds are breached.
Backlit triple LCD display: Simultaneously shows CO₂, temperature and humidity (and possibly dew point/wet-bulb) in an easy-to-read format, even in lower light.
PC interface & data logging: Built-in RS-232 interface for connecting to a PC; the product comes bundled with software and cable to record/document CO₂, humidity, and temperature data.
Portable form factor: Lightweight and compact (approx. 200 × 70 × 57 mm; weight ~190 g/6.7 oz) — convenient for mobile measurements and field inspections.
Complete kit included: Comes with software, RS-232 cable, 4 × AA batteries and carrying case (making it ready for field use).
Calibration accessory support: Optional humidity calibration bottles (33% & 75% RH) are supported via Extech’s RH300-CAL kit.

Specifications

General
Carbon Dioxide [CO2]	0 to 5,000ppm
Carbon Dioxide [CO2] Max Resolution	1ppm
Relative Humidity	0.0 to 99.9%
Relative Humidity Max Resolution	0.10%
Temperature [Air]	14 to 140°F (-10 to 60°C)
Temperature [Air] Max Resolution	0.1°F/°C