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Here are solid options depending on which gas you need to detect and whether you want simple analog sensing or calibrated digital measurement.
Budget MQ-series (analog, good for hobby leak detection)
- Gravity: Arduino Gas Sensor (MQ2) ($11.80) — detects LPG/i-butane/propane/methane/alcohol/hydrogen/smoke (broad, general-purpose).
- Gravity: Arduino CO/Combustible Gas Sensor (MQ9) ($13.10) — focused on CO + combustible gases (methane/propane).
- Methane CNG Gas Sensor - MQ-4 ($14.95) — methane / natural gas.
- LPG Gas Sensor - MQ-6 ($14.95) — propane/butane (LPG).
- Hydrogen Gas Sensor - MQ-8 ($16.00) — hydrogen.
- Alcohol Gas Sensor - MQ-3 ($18.35) — alcohol / breathalyzer-style sensing.
- If you already have an MQ “can” sensor and need an adapter/carrier: Gas Sensor Breakout ($3.05) or Pololu Carrier for MQ Gas Sensors (Bare PCB Only) ($2.25).
Indoor air quality / VOC sensing (digital I2C breakouts)
- SGP41 VOC & NOx Gas Sensor Breakout ($49.05) — I2C sensor for VOC + NOx indices (great for IAQ projects).
- Adafruit ENS160 MOX Gas Sensor - Sciosense CCS811 Upgrade ($45.40) — I2C MOX gas sensor aimed at IAQ/eCO2/TVOC-style outputs.
- Adafruit MiCS5524 CO, Alcohol and VOC Gas Sensor Breakout ($30.80) — analog-style breakout useful for CO/alcohol/VOC type detection.
CO2 sensors (choose “true CO2” when you need real ppm)
- Gravity: STCC4 True Carbon Dioxide (CO2) Sensor (3-in-1 Air Quality Monitoring, 400 ~ 5000ppm) ($36.65) — 400–5000 ppm, compact option for typical indoor monitoring.
- Adafruit SCD-30 - NDIR CO2 Temperature and Humidity Sensor - STEMMA QT / Qwiic ($131.55) — true NDIR CO2 with temperature + humidity, good accuracy for IAQ.
- For building/industrial style installs: DFRobot SEN0659 Industrial RS485 NDIR CO2 Sensor - 400-5000ppm ($142.60) — RS485, IP65, 400–5000 ppm.
Factory-calibrated specialty gas sensors (higher cost, better specificity)
- Gravity Calibrated NH3 Ammonia Sensor - I2C/UART ($336.60) — calibrated ammonia (NH3) with analog/I2C/UART outputs.
- Gravity HF Gas Sensor (Calibrated) - I2C/UART/Analogue ($611.95) — calibrated hydrogen fluoride (HF) with analog/I2C/UART outputs.
What gas (or use-case) are you trying to measure?
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Showing 1-20 of 57 products · 3 unavailable products hidden
Fermion: MEMS Methane CH4 Gas Detection Sensor (Breakout, 1-10000ppm)
Fermion: MEMS Methane CH4 Gas Detection Sensor employs state-of-the-art micro-electromechanical system (MEMS) technology, endowing the sensor with compact dimensions (13x13x2.5mm), low power consumption (<20mA), minimal heat generation, short preheating time, and swift response recovery. The sens...
Fermion: MEMS Ethanol EtOH Gas Detection Sensor (Breakout, 1-500ppm)
The Fermion MEMS Ethanol (EtOH) Gas Detection Sensor uses micro-electromechanical system (MEMS) technology for compact, low-power ethanol gas detection. With a detection range of 1–500 ppm, it provides qualitative measurement of ethanol concentration via an analogue voltage output. The MEMS desi...
Fermion: MEMS Nitrogen Dioxide NO2 Gas Detection Sensor (Breakout, 0.1-10ppm)
Fermion: MEMS Nitrogen Dioxide NO2 Gas Detection Sensor employs state-of-the-art micro-electromechanical system (MEMS) technology, endowing the sensor with compact dimensions (13x13x2.5mm), low power consumption (<20mA), minimal heat generation, short preheating time, and swift response recovery....
Fermion: MEMS Formaldehyde HCHO Gas Detection Sensor (Breakout, 0-3ppm)
Fermion: MEMS Formaldehyde HCHO Gas Detection Sensor employs state-of-the-art micro-electromechanical system (MEMS) technology, endowing the sensor with compact dimensions (13x13x2.5mm), low power consumption (<20mA), minimal heat generation, short preheating time, and swift response recovery. Th...
SGP41 VOC & NOx Gas Sensor Breakout
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Build a digital nose for indoor air quality projects with this SGP41 gas sensor breakout. The Sensirion SGP41 is a fully integrated MOX gas sensor with I2C interfacing, so you do not need to manage heater control or analogue readings yourself.The sensor combines two MOX hot-plate sensing elements...
Fermion: MEMS Ammonia NH3 Gas Detection Sensor (Breakout, 1-300ppm)
Fermion: MEMS Ammonia NH3 Gas Detection Sensor employs state-of-the-art micro-electromechanical system (MEMS) technology, endowing the sensor with compact dimensions (13x13x2.5mm), low power consumption (<20mA), minimal heat generation, short preheating time, and swift response recovery. The sens...
Gravity Calibrated NH3 Ammonia Sensor - I2C/UART
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This calibrated gas sensor measures ammonia concentration in the environment using an electrochemical probe. It supports three output modes — analogue, I2C and UART — so it can slot into a wide range of microcontroller and single-board computer projects.The probe is factory-calibrated for quick s...
LPG Gas Sensor - MQ-6
A simple-to-use MQ-6 gas sensor for detecting liquefied petroleum gas (LPG) — primarily propane and butane — in the air. The sensor detects concentrations from 200 to 10,000 ppm with high sensitivity and fast response time. The MQ-6 outputs an analog resistance that varies with gas concentration...
Gravity: Arduino LPG Gas Sensor (MQ5)
The Gravity MQ5 gas sensor is highly sensitive to LPG, natural gas, and town gas, with lower sensitivity to alcohol, cooking fumes, and cigarette smoke. The analogue output is proportional to gas concentration, and sensitivity can be adjusted via the on-board potentiometer. Gravity interface for ...
AGS02MA TVOC Gas Sensor
The AGS02MA is a MEMS-based TVOC (Total Volatile Organic Compounds) gas sensor with a calibrated digital signal output. It detects a range of polluting gases including ethanol, ammonia, sulfides, benzene vapours, and smoke, making it suitable for air quality monitoring applications. This sensor ...
Gravity: Arduino CO/Combustible Gas Sensor (MQ9)
The Gravity MQ-9 gas sensor detects carbon monoxide (CO) and combustible gases including methane and propane. It uses a semiconductor SnO2 sensing element that cycles between high and low temperatures — detecting CO at low temperature (1.5V) and combustible gases at high temperature (5.0V). With...
Gravity: Alcohol Sensor (0-5ppm)
This is an Arduino compatible alcohol sensor module from DFRobot with a 0-5ppm measuring range, supporting I2C and UART outputs. Aiming at fast and accurate detection of alcohol gas concentration in the air, the sensor is well applicable to the small alcohol concentration measurement in...
Threshold Formaldehyde HCHO Detection Sensor (0-20ppm)
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##Introduction This formaldehyde gas sensor differs from most gas sensors on the market as it does not provide specific gas concentration data. Instead, it detects whether the surrounding environment exceeds or falls below a fixed threshold. It operates on a wide voltage range of 5-24V, with high...
AGS02MA I2C TVOC Gas Sensor
The AGS02MA is a compact MOX-based TVOC (Total Volatile Organic Compounds) gas sensor with an I2C interface. It features a built-in ADC that outputs gas resistance and parts-per-billion (ppb) readings — higher ppb values indicate more organic compounds in the air. This is a simple, inexpensive s...
ZMOD4450 Refrigeration Air Quality Gas Sensor Module
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The ZMOD4450 is a compact gas sensor module for detecting gases associated with food ripening or rotting. It is intended for refrigeration air quality (RAQ) applications such as food storage and shipping, including humid and dusty environments where water spray, condensation or immersion may be p...
Adafruit MiCS5524 CO, Alcohol and VOC Gas Sensor Breakout
The Adafruit MiCS-5524 Gas Sensor Breakout is a robust MEMS sensor from SGX Sensortech for detecting carbon monoxide, natural gas leaks, alcohol, and volatile organic compounds (VOCs). It provides a simple analogue voltage output that increases in proportion to the concentration of detected gas —...
Ammonia Gas Sensor - MQ-137
The MQ-137 is an ammonia (NH3) gas sensor from Winsen, designed to detect ammonia concentrations in the air. The sensing element is tin dioxide (SnO2), which has lower conductivity in clean air and increases in conductivity as ammonia gas concentration rises. A simple voltage divider circuit can...
Gravity: Arduino Alcohol Sensor (MQ3)
An analogue alcohol gas sensor based on the MQ-3 probe, designed for use with Arduino and other microcontrollers. The sensor outputs a voltage proportional to the concentration of alcohol vapour in the surrounding air, making it suitable for breathalyser-style projects, air quality monitoring, an...
Gravity: Arduino Gas Sensor (MQ2)
INTRODUCTION This is a generic Arduino gas sensor. It has MQ2 probe which is able to detect LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke.It can be used in gas leakage detecting device in consumer and industry markets. It has a high sensitivity and fast response time. ...
Alcohol Gas Sensor - MQ-3
The MQ-3 is an alcohol gas sensor suitable for detecting alcohol concentration in the air, similar to a breathalyser. It provides an analog resistive output based on alcohol concentration, with high sensitivity and fast response time. The drive circuit is simple — just one resistor is needed, and...
