---
product_id: 25742880
title: "Portable CO2 Meter Handheld CO2 Detector Monitor 0~9999ppm, Carbon Dioxide Meter with Alarm Function, Temperature & Humidity Meter NDIR Sensor Air Quality Monitor for Home Trip Classroom and Office"
brand: "gain express"
price: "₩376271"
currency: KRW
in_stock: true
reviews_count: 13
category: "Gain Express"
url: https://www.desertcart.kr/products/25742880-portable-co2-meter-handheld-co2-detector-monitor-0-9999ppm-carbon
store_origin: KR
region: South Korea
---

# Humidity 0.1~99.9% ±3%RH CO2 range 0~9999ppm ±5-10% Temp range -10~60°C ±0.6°C Portable CO2 Meter Handheld CO2 Detector Monitor 0~9999ppm, Carbon Dioxide Meter with Alarm Function, Temperature & Humidity Meter NDIR Sensor Air Quality Monitor for Home Trip Classroom and Office

**Brand:** gain express
**Price:** ₩376271
**Availability:** ✅ In Stock

## Summary

> 🌬️ Breathe smarter, work safer — your pocket-sized air quality guardian.

## Quick Answers

- **What is this?** Portable CO2 Meter Handheld CO2 Detector Monitor 0~9999ppm, Carbon Dioxide Meter with Alarm Function, Temperature & Humidity Meter NDIR Sensor Air Quality Monitor for Home Trip Classroom and Office by gain express
- **How much does it cost?** ₩376271 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/25742880-portable-co2-meter-handheld-co2-detector-monitor-0-9999ppm-carbon)

## Best For

- gain express enthusiasts

## Why This Product

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

## Key Features

- • **Precision Air Insight:** High-accuracy NDIR sensor delivers reliable CO2 readings up to 9999ppm, empowering smarter ventilation decisions.
- • **All-in-One Climate Tracker:** Monitors temperature, humidity, dew point, and wet bulb for comprehensive indoor air quality awareness.
- • **Portable Power Flexibility:** Dual power options with long-lasting AA batteries or 9V adapter keep you measuring anywhere, anytime.
- • **Instant Alerts for Safer Spaces:** Built-in audible alarm warns you when CO2 levels exceed healthy thresholds—stay ahead of poor air quality.
- • **Rugged & Ready for Professionals:** Durable, lightweight design with easy manual calibration—perfect for offices, classrooms, and on-the-go monitoring.

## Overview

This handheld Portable CO2 Meter features a high-accuracy NDIR sensor measuring CO2 levels from 0 to 9999ppm with ±5-10% accuracy, alongside precise temperature (-10 to 60°C) and humidity (0.1% to 99.9% RH) monitoring. Designed for professionals and health-conscious users, it offers dual power sources, an audible alarm for elevated CO2, and versatile environmental metrics, making it ideal for offices, classrooms, and indoor air quality surveys.

## Description

Portable CO2 Meter Handheld CO2 Detector Monitor 0~9999ppm, Carbon Dioxide Meter with Alarm Function, Temperature & Humidity Meter NDIR Sensor Air Quality Monitor for Home Trip Classroom and Office: desertcart.com: Industrial & Scientific

Review: Quirky late 1980’s design aesthetic but it works - Indispensable instrument in this time of pandemic to ensure that your environment is adequately ventilated. I’m glad I bought this; my tightly sealed house had a reading of 1600 PPM CO2 and this meter clearly shows when the windows have been opened long enough to bring CO2 down to a healthier level of 600 to 800 ppm. Buy this if you want to look like a contractor. It’s ginormous and yelliw but actually light weight, especially for the size. C02 reading comes up in 30 seconds after a countdown; initial indoor relative humidity indoors after unit is outdoors takes a while to stabilize maybe ten or 15 minutes. The toggle between air, wet bulb, and dew point temperature is nice; kind of wish it also showed heat index. Now the bad: Terrible human factors design; without the manual you’d never figure this thing out - fortunately the tiny manual explains it all pretty well. Don’t lose the manual. Buttons are excessively debounced to the point that sometimes a button press isn’t recognized. A RS232 interface??? Stone age technology and forget about using your phone to log data. Alarm initially set to 1000 PPM probably isn’t a good choice; if you take this to your local grocery store or neighborhood bar or school or workplace and make a measurement that’s above this strict limit you’ll freak everyone out. It’s easily changed (but don’t forget the manual) I would buy this again. It works well. I like it.
Review: Good quality and durable - We've bought several of these over the years and they are workhorses. Alway work, battery lasts forever, accurate and consistent.

## Features

- HIGH ACCURACY: CO2 Accuracy 0~2000ppm(±50ppm or ±5% of the reading); 2000~9999ppm(±10% of the reading)
- LARGE MEASURING RANGE: CO2: 0~9999ppm ; Temperature: -10~60°C(Accuracy ±0.6°C) ; Humidity: 0.1% ~ 99.9%RH(Accuracy ±3%RH) ; Dew Point: -20.0~59.9°C ; Wet Bulb: -5.0~59.9°C
- USER FRIENDLY: Portable Handle Design; Easily manual calibration on CO2 and humidity; Stable NDIR CO2 sensor
- POWER SUPPLY: Dual power source battery (included) or 9V adaptor (NOTED: adaptor is not included in set); Power from battery is automatically cut off when 9V adaptor is in use
- APPLICATION: IAQ monitoring and survey; especially on CO2 level and air ventilation become widely applied in public areas such as offices; classrooms; factories; hospitals and hotels

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01966BZDY |
| Alarm | Audible |
| Batteries | 4 AA batteries required. |
| Best Sellers Rank | #51,598 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #85 in Indoor Air Quality Meters |
| Brand | Gain Express |
| Color | Yellow |
| Date First Available | December 10, 2015 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 7.1 ounces |
| Item model number | A017755 |
| Manufacturer | Gain Express Holdings Ltd |
| Operating Humidity | 99 9 percent |
| Power Source | Battery Powered |
| Product Dimensions | 2.76 x 2.17 x 8.27 inches |
| Style | Digital CO2 Meter |
| UPC | 600316560665 |
| Upper Temperature Rating | 60 Degrees Celsius |

## Product Details

- **Alarm:** Audible
- **Brand:** Gain Express
- **Color:** Yellow
- **Item Weight:** 200 Grams
- **Manufacturer:** Gain Express Holdings Ltd
- **Operating Humidity:** 99 9 percent
- **Power Source:** Battery Powered
- **Style:** Digital CO2 Meter
- **UPC:** 600316560665
- **Upper Temperature Rating:** 60 Degrees Celsius

## Images

![Portable CO2 Meter Handheld CO2 Detector Monitor 0~9999ppm, Carbon Dioxide Meter with Alarm Function, Temperature & Humidity Meter NDIR Sensor Air Quality Monitor for Home Trip Classroom and Office - Image 1](https://m.media-amazon.com/images/I/71+eOoxRUgL.jpg)

## Questions & Answers

**Q: Can you connect a hose for scientific experiments?**
A: No.

**Q: what is the country of origin?**
A: Made it China, but it seems to be an accurate measurement.

**Q: Do you sell the software and hardware for data collection separately for this unit?**
A: Yes, you can buy the software and cable from the link below.

ASIN: B01BWJIRMK
URL: https://www.amazon.com/dp/B01BWJIRMK?ref=myi_title_dp

**Q: How accurate is the co2 sensor?**
A: Very

## Customer Reviews

### ⭐⭐⭐⭐⭐ Quirky late 1980’s design aesthetic but it works
*by J***E on August 15, 2020*

Indispensable instrument in this time of pandemic to ensure that your environment is adequately ventilated. I’m glad I bought this; my tightly sealed house had a reading of 1600 PPM CO2 and this meter clearly shows when the windows have been opened long enough to bring CO2 down to a healthier level of 600 to 800 ppm. Buy this if you want to look like a contractor. It’s ginormous and yelliw but actually light weight, especially for the size. C02 reading comes up in 30 seconds after a countdown; initial indoor relative humidity indoors after unit is outdoors takes a while to stabilize maybe ten or 15 minutes. The toggle between air, wet bulb, and dew point temperature is nice; kind of wish it also showed heat index. Now the bad: Terrible human factors design; without the manual you’d never figure this thing out - fortunately the tiny manual explains it all pretty well. Don’t lose the manual. Buttons are excessively debounced to the point that sometimes a button press isn’t recognized. A RS232 interface??? Stone age technology and forget about using your phone to log data. Alarm initially set to 1000 PPM probably isn’t a good choice; if you take this to your local grocery store or neighborhood bar or school or workplace and make a measurement that’s above this strict limit you’ll freak everyone out. It’s easily changed (but don’t forget the manual) I would buy this again. It works well. I like it.

### ⭐⭐⭐⭐⭐ Good quality and durable
*by C***T on August 24, 2024*

We've bought several of these over the years and they are workhorses. Alway work, battery lasts forever, accurate and consistent.

### ⭐⭐⭐⭐ Adjust the readings for altitude, calibrating it outside may not work
*by L***Y on February 25, 2022*

From the SPECIFICATION, the CO2 readings must be increased by 1.6% for each kPa below normal pressure (101.33 kPa). At an altitude of 1000 feet (above sea level) the pressure is 97.717 kPa so the readings must be multiplied by 1.0578 101.33 – 97.717 = 3.613 3.613 x 1.6 = 5.78 The meter instructions say regularly calibrate it and they say it can be calibrated outside in well ventilated sunny weather. But, an accurate calibration outside probably isn’t possible. The meter instructions say it can be calibrated outside but it also says the CO2 concentration must be 400 ppm where the calibration occurs. The calibration instructions don’t mention that the calibration would need to be done at sea level and they don’t mention 400 ppm probably doesn’t occur at sea level in the northern hemisphere. If 400 ppm occurred at sea level and if the calibration was done at 1000 feet altitude, then an error of 5.78% would occur in the meter after the calibration. The lowest dry mole fraction of CO2 in the northern hemisphere may be at a remote location like Mauna Loa. 420.85 ppm CO2 was the Daily Average dry mole fraction at Mauna Loa February 24 2022. It can be 500 ppm in a city like New York. Mauna Loa is the only place I could find with daily CO2 measurements. The last time it was 400 ppm at Mauna Loa was around 2015. The dry mole fraction doesn’t vary with altitude but the concentration does vary with altitude (from “How we measure background CO2 levels on Mauna Loa”). So, the meter must be measuring the concentration since the readings must be adjusted if it isn’t used at sea level.

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-02*