--- product_id: 10335593 title: "Extech CO250 Portable Air Quality CO2 Meter with Datalogger" price: "VT93737" currency: VUV in_stock: true reviews_count: 8 url: https://www.desertcart.vu/products/10335593-extech-co250-portable-air-quality-co2-meter-with-datalogger store_origin: VU region: Vanuatu --- # 99-record datalogger Advanced NDIR CO₂ sensor Multi-parameter sensing Extech CO250 Portable Air Quality CO2 Meter with Datalogger **Price:** VT93737 **Availability:** ✅ In Stock ## Summary > 🌬️ Breathe smarter, work safer — your indoor air quality ally! ## Quick Answers - **What is this?** Extech CO250 Portable Air Quality CO2 Meter with Datalogger - **How much does it cost?** VT93737 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/10335593-extech-co250-portable-air-quality-co2-meter-with-datalogger) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Portable Powerhouse:** Compact, lightweight design with a large backlit LCD and intuitive keypad—perfect for on-the-go professionals. - • **Data-Driven Decisions:** Store and review up to 99 data sets to identify trends and ensure workplace safety compliance. - • **Precision CO₂ Tracking:** Stay ahead with accurate 0-5000 ppm CO₂ readings using cutting-edge NDIR technology. - • **Versatile Application Ready:** Ideal for offices, classrooms, labs, and HVAC inspections where air quality matters most. - • **Comprehensive Environmental Insight:** Simultaneously monitor temperature, humidity, dew point, and wet bulb for full indoor air quality clarity. ## Overview The Extech CO250 is a portable indoor air quality meter featuring an advanced NDIR sensor for precise CO₂ measurement up to 5,000 ppm. It simultaneously tracks temperature, humidity, dew point, and wet bulb, storing up to 99 readings for trend analysis. Designed for professionals, it offers a large backlit LCD, user-friendly interface, and comes complete with data acquisition software, batteries, and carrying case—perfect for ensuring optimal air quality in diverse environments. ## Description Product Description The Extech CO250 Portable Indoor Air Quality CO₂ Meter is a professional tool for evaluating and maintaining healthy indoor environments. Designed with a high-accuracy NDIR sensor, it delivers precise carbon dioxide measurements up to 5,000 ppm, along with temperature, humidity, dew point, and wet bulb readings. Its portable handheld design and large backlit LCD make it easy to operate in the field, while the 99-record datalogging function allows convenient trend analysis and compliance documentation. Whether monitoring offices, schools, laboratories, factories, or greenhouses, the CO250 ensures accurate air quality insights for safety, comfort, and regulatory requirements. Built for HVAC technicians, building inspectors, and facility managers, this reliable meter provides the data needed to identify poor ventilation, optimize systems, and ensure safe indoor environments. From the Manufacturer 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. Review: Impressive accuracy and price - I was looking at the Testo 315-3 but was put off by the price as I won't be using it often. So I decided to go for this Extech for a third of the price, and have been very happy with it's performance. I actually borrowed a friend's Testo 315-3 and compared the two devices side by side (see photo). The Extech is just as accurate as the Testo (tested up to around 1000 ppm). The Testo is slightly faster to react on increasing CO2 levels (by 5-10 seconds), but the same reaction time to decreasing CO2. Also the Extech has better 1ppm resolution, whereas the Testo has 10ppm resolution. As for long-term accuracy and reliability; time will tell I suppose. The Extech has a RS-232 serial cable for data output which was another deciding factor for me. Each second it outputs live readings of CO2, dry-bulb temperature, relative humidity, dew-point temperature, and wet-bulb temperature over it's serial connection. The software that came with it is the typical old and clunky software, but I've since written my own Java library for data monitoring (you can find it on GitHub). I found that a cheap RS-232 to USB converter worked fine as my laptop doesn't have a DB-9 serial port. As others have mentioned it doesn't include a power supply. I bought one locally for cheap. You'll need a 9VDC, 1A supply. I found that a 4.0x1.7mm power jack fit well (centre-positive). Also, the device looks like a CB radio or ancient Nokia phone!! Not the sexiest looking device, but that matters little for my work. I'm happy to recommend this to others. Review: Does Not Come With Everything You Need - Just received my device today. Here are some observations: 1. The unit comes with a cable that lets you connect it to a computer so you could send and analyze data. However, it is an RS232 cable that needs to be connected to a computer's serial port. Most laptops do not come with serial ports, so you will either have to go out and buy an additional adapter that could be plugged into your laptop's USB port, or you will have to borrow grandpa's old desktop computer to plug it in. 2. The software on the CD that comes with the unit only works on Windows XP. I discussed this with Extech technical support and they are "working on an upgrade". Microsoft just recently stopped supporting Windows XP. New computers all come with Windows 8. A lot of people are still running Windows 7. So unless you have an old computer running Windows XP, or you have the technical ability to set up a virtual environment running Windows XP on your newer laptop, the included software will do you no good. 3. It has an AC adapter on the side so you could connect a power source. However, for a price of $400, it does not come with one and you cannot order one from them. If you call Extech technical support, they will send you an email with the specifications. You then either have to go somewhere like Radio Shack or order one online. The reason for the two stars is that $400 is a lot to pay for a device that requires you to buy additional accessories like a power supply and a USB adapter. The fact that the software only works on Windows XP basically renders that functionality useless. That's kind of like sending out an instruction video, but then having it only work if you have a VCR or Betamax. All this device seems to do in its shipped condition is to provide you current readings. You cannot do any analysis without the software or cable adapter. You could get the same results for less than half the price with other products. The device itself appears to be accurate and sturdy. Extech technical support was easy to contact and the person was responsive. ## 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 ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 3.8 out of 5 stars 18 Reviews | ## Images ![Extech CO250 Portable Air Quality CO2 Meter with Datalogger - Image 1](https://m.media-amazon.com/images/I/51Ap8KetxCL.jpg) ## Questions & Answers **Q: Does it data logging? If so, how can the data is recovered?** A: Built-in RS-232 interface for capturing readings on PC * Data acquisition software and cable included to record and document CO2, Humidity and Temperature data **Q: Does it come with certificate of calibration?** A: The standard calibration price is $195. and the option is NIST Certificate. this will add 1 week to your order. **Q: If one does not pay to have it calibrated as in the other answer, how does the meter establish a baseline?** A: Turn it on outside for baseline readings. **Q: Can it be calibrated at a later date?** A: Thank you for your question. The calibration for new item is made by the manufacturer, so it is not possible to set up the later date. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Impressive accuracy and price *by D***N on March 24, 2018* I was looking at the Testo 315-3 but was put off by the price as I won't be using it often. So I decided to go for this Extech for a third of the price, and have been very happy with it's performance. I actually borrowed a friend's Testo 315-3 and compared the two devices side by side (see photo). The Extech is just as accurate as the Testo (tested up to around 1000 ppm). The Testo is slightly faster to react on increasing CO2 levels (by 5-10 seconds), but the same reaction time to decreasing CO2. Also the Extech has better 1ppm resolution, whereas the Testo has 10ppm resolution. As for long-term accuracy and reliability; time will tell I suppose. The Extech has a RS-232 serial cable for data output which was another deciding factor for me. Each second it outputs live readings of CO2, dry-bulb temperature, relative humidity, dew-point temperature, and wet-bulb temperature over it's serial connection. The software that came with it is the typical old and clunky software, but I've since written my own Java library for data monitoring (you can find it on GitHub). I found that a cheap RS-232 to USB converter worked fine as my laptop doesn't have a DB-9 serial port. As others have mentioned it doesn't include a power supply. I bought one locally for cheap. You'll need a 9VDC, 1A supply. I found that a 4.0x1.7mm power jack fit well (centre-positive). Also, the device looks like a CB radio or ancient Nokia phone!! Not the sexiest looking device, but that matters little for my work. I'm happy to recommend this to others. ### ⭐⭐ Does Not Come With Everything You Need *by R***O on November 14, 2014* Just received my device today. Here are some observations: 1. The unit comes with a cable that lets you connect it to a computer so you could send and analyze data. However, it is an RS232 cable that needs to be connected to a computer's serial port. Most laptops do not come with serial ports, so you will either have to go out and buy an additional adapter that could be plugged into your laptop's USB port, or you will have to borrow grandpa's old desktop computer to plug it in. 2. The software on the CD that comes with the unit only works on Windows XP. I discussed this with Extech technical support and they are "working on an upgrade". Microsoft just recently stopped supporting Windows XP. New computers all come with Windows 8. A lot of people are still running Windows 7. So unless you have an old computer running Windows XP, or you have the technical ability to set up a virtual environment running Windows XP on your newer laptop, the included software will do you no good. 3. It has an AC adapter on the side so you could connect a power source. However, for a price of $400, it does not come with one and you cannot order one from them. If you call Extech technical support, they will send you an email with the specifications. You then either have to go somewhere like Radio Shack or order one online. The reason for the two stars is that $400 is a lot to pay for a device that requires you to buy additional accessories like a power supply and a USB adapter. The fact that the software only works on Windows XP basically renders that functionality useless. That's kind of like sending out an instruction video, but then having it only work if you have a VCR or Betamax. All this device seems to do in its shipped condition is to provide you current readings. You cannot do any analysis without the software or cable adapter. You could get the same results for less than half the price with other products. The device itself appears to be accurate and sturdy. Extech technical support was easy to contact and the person was responsive. ### ⭐⭐⭐⭐⭐ Five Stars *by D***O on November 7, 2016* Excellent equipment ## Frequently Bought Together - Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger - Extech LT45 LED Light Meter --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/10335593-extech-co250-portable-air-quality-co2-meter-with-datalogger](https://www.desertcart.vu/products/10335593-extech-co250-portable-air-quality-co2-meter-with-datalogger) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-09-05*