---
product_id: 453127517
title: "1PCS MQ-138 MQ138 Formaldehyde HCHO Volatile Organic Compounds (VOC) Gas Sensor Module with Alarm Signal Light"
brand: "huaban"
price: "R4459"
currency: ZAR
in_stock: true
url: https://www.desertcart.co.za/products/453127517-1pcs-mq-138-mq138-formaldehyde-hcho-volatile-organic-compounds-voc
store_origin: ZA
region: South Africa
---

# Fast <1s response Compact 35x40x28mm Wide -10~50°C range 1PCS MQ-138 MQ138 Formaldehyde HCHO Volatile Organic Compounds (VOC) Gas Sensor Module with Alarm Signal Light

**Brand:** huaban
**Price:** R4459
**Availability:** ✅ In Stock

## Summary

> 🌬️ Breathe Smart, Live Smarter — Your Air Quality Guardian

## Quick Answers

- **What is this?** 1PCS MQ-138 MQ138 Formaldehyde HCHO Volatile Organic Compounds (VOC) Gas Sensor Module with Alarm Signal Light by huaban
- **How much does it cost?** R4459 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/453127517-1pcs-mq-138-mq138-formaldehyde-hcho-volatile-organic-compounds-voc)

## Best For

- huaban enthusiasts

## Why This Product

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

## Key Features

- • **Instant VOC Alerts:** Detect formaldehyde and VOCs in under 1 second to keep your environment safe and fresh.
- • **Visual Alarm Signal:** Integrated alarm light ensures you never miss critical air quality changes—stay ahead of harmful gases.
- • **Compact & Lightweight:** Slim 35x40x28mm footprint and just 20g, ideal for seamless integration into smart devices or DIY projects.
- • **Robust Operating Range:** Reliable performance from chilly -10°C to warm 50°C, perfect for any workspace or home.
- • **Energy Efficient Design:** Consumes less than 0.9W, balancing power and precision for continuous monitoring.

## Overview

The HUABAN MQ-138 Formaldehyde HCHO VOC Gas Sensor Module offers ultra-fast detection (<1s) of harmful gases within a 1-100ppm range. Operating efficiently at 5V with low power consumption (<0.9W), it supports a broad temperature range (-10 to 50°C) and high humidity tolerance (up to 95% RH). Its compact size and built-in visual alarm make it an essential tool for proactive air quality monitoring in professional and home environments.

## Description

Features: 1, Heating voltage: 5 ±0.2V (AC·DC) 2, Working current: 180mA 3, Circuit voltage: DC5V (Max DC 24V) 4, Load resistance: 10K (adjustable) 5, Test concentration range :1-100ppm 6, Clean air voltage: <1.5V 7, Sensitivity: > 3% 8, Response time: <1S (3-5 minute warm-up, theory preheating time 48 hours) 9, Response time: <30S 10, Component power consumption: <0.9W 11, Working temperature: -10 ~ 50 oC (nominal temperature 20 oC) 12, Humidity: 95% RH (nominal humidity 65% RH) 13, Life: 5 years 14, Size: 35mm×40mm×28mm 15, Weight Size: 15g (approximately)

## Features

- MQ-138 Formaldehyde HCHO Gas Sensor Module
- Heating voltage: 5 +0.2V (AC·DC);Working current: 180mA;Circuit voltage: DC5V (Max DC24V);Clean air voltage: < 1.5V
- Test concentration range :1-100ppm ; Sensitivity: >3% ; Response time: < 1S (3-5 minute warm-up, theory preheating time 48 hours)
- Working temperature: -10 ~ 50 oC (nominal temperature 20 oC) ; Humidity: 95% RH (nominal humidity 65% RH)
- Size: 35mm×40mm×28mm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | HUABAN |
| Style | Compact |
| Product Dimensions | 35D x 28W x 40H Millimeters |
| Item Weight | 0.02 Kilograms |
| Alarm | Visual |
| Operating Humidity | 95 percent |
| Sensor Type | gas sensor |
| Manufacturer | HUABAN |
| Model number | MQ-136 |
| Item Weight | 20 g |
| Item model number | MQ-136 |
| Are batteries included? | No |

## Product Details

- **Brand:** HUABAN
- **Style:** Compact
- **Product Dimensions:** 35D x 28W x 40H Millimeters
- **Item Weight:** 0.02 Kilograms
- **Alarm:** Visual
- **Operating Humidity:** 95 percent
- **Sensor Type:** gas sensor
- **Manufacturer:** HUABAN

## Images

![1PCS MQ-138 MQ138 Formaldehyde HCHO Volatile Organic Compounds (VOC) Gas Sensor Module with Alarm Signal Light - Image 1](https://m.media-amazon.com/images/I/71EhBJRrx0L.jpg)
![1PCS MQ-138 MQ138 Formaldehyde HCHO Volatile Organic Compounds (VOC) Gas Sensor Module with Alarm Signal Light - Image 2](https://m.media-amazon.com/images/I/71zSE+OPJfL.jpg)

## Available Options

This product comes in different **Size** options.

## Frequently Bought Together

- HUABAN 1PCS MQ-138 MQ138 Formaldehyde HCHO Volatile Organic Compounds (VOC) Gas Sensor Module with Alarm Signal Light
- EC Buying MS1100 Gas Sensor, VOCs Sensor for Air Quality, Carbon Dioxide Formaldehyde Monitoring TVOC CO2 Gas Sensor Module, Sensor Arduino I2C

---

## 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.co.za/products/453127517-1pcs-mq-138-mq138-formaldehyde-hcho-volatile-organic-compounds-voc](https://www.desertcart.co.za/products/453127517-1pcs-mq-138-mq138-formaldehyde-hcho-volatile-organic-compounds-voc)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-01*