---
product_id: 276186307
title: "Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger"
brand: "extech"
price: "C$59206"
currency: NIO
in_stock: false
reviews_count: 5
category: "Extech"
url: https://www.desertcart.ni/products/276186307-extech-co250-portable-indoor-air-quality-co2-meter-datalogger
store_origin: NI
region: Nicaragua
---

# 99-record datalogger RS-232 data output Multi-parameter sensing Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger

**Brand:** extech
**Price:** C$59206
**Availability:** ❌ Out of Stock

## Summary

> 🌬️ Breathe smarter, work sharper — your air quality ally on the go!

## Quick Answers

- **What is this?** Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger by extech
- **How much does it cost?** C$59206 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/276186307-extech-co250-portable-indoor-air-quality-co2-meter-datalogger)

## Best For

- extech enthusiasts

## Why This Product

- Trusted extech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Portable & Intuitive:** Compact handheld design with large backlit LCD and user-friendly keypad—perfect for on-the-go professionals.
- • **Data-Driven Decisions:** Stores up to 99 data sets, empowering trend analysis and compliance reporting with ease.
- • **Precision CO₂ Tracking:** Advanced NDIR sensor delivers accurate readings from 0 to 5,000 ppm for confident indoor air quality management.
- • **Versatile Application Ready:** Ideal for offices, classrooms, labs, greenhouses, and HVAC inspections where air quality matters most.
- • **Comprehensive Environmental Insight:** Simultaneously monitors temperature, humidity, dew point, and wet bulb for a full-spectrum indoor climate snapshot.

## 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 temperatures, storing up to 99 readings for trend monitoring. Designed for professionals, it offers RS-232 data output for live data streaming, a large backlit LCD, and an intuitive keypad, making it ideal for HVAC, laboratory, and workplace air quality assessments.

## Description

Bottle, Capacity 32 Oz. , Basic Material Glass, Shape Boston Round, Mouth Narrow, Screw Closure Size 33-400Mm, Body Color Amber, Body Material Glass, Closure Color Black, Closure Material Phenolic Pulp/Vinyl, Graduation Range Not Specified, Height 210Mm, Diameter 94Mm, Package Quantity 12

Review: 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: 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 |
|---------------|-------|
| ASIN | B0029V2GB4 |
| Item model number | CO250 |
| Manufacturer | Extech |
| Product Dimensions | 7 x 5.7 x 20 cm; 189.94 g |

## Images

![Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger - Image 1](https://m.media-amazon.com/images/I/314lncBCuqL.jpg)
![Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger - Image 2](https://m.media-amazon.com/images/I/41UYsXWlPqL.jpg)
![Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger - Image 3](https://m.media-amazon.com/images/I/61ZummmaegL.jpg)
![Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger - Image 4](https://m.media-amazon.com/images/I/71tSenpNJtL.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

### ⭐⭐⭐⭐⭐ Review
*by D***N on 24 March 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.

### ⭐⭐ Review
*by R***O on 14 November 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.

### ⭐⭐⭐ Review
*by L***. on 14 September 2011*

Make sure you're happy only using battery power.. This seems like a perfect compromise between budget and the Extech SD-800, because this one can log info if connected to a computer --ie. the essential features of the SD-800 if a computer can be used nearby.. However, this Extech CO250 does not come with a power supply for the 9VDC socket. Some Extech CO250s do come with an external power unit. Extech does not sell a separate power unit. Also, Extech Technical service states that they don't have any information about the power unit requirements, so they cannot recommend an alternate power source without potentially voiding the warranty. Using any power unit not included with the meter will void the warranty and potentially damage the meter.

## Frequently Bought Together

- Extech CO250 Portable Indoor Air Quality CO2 Meter/Datalogger
- Extech LT45 LED Light Meter

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-02-28*