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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 81-92 of 92 products · 8 unavailable products hidden
High Power 100mW 2.4G Wireless Transceiver Module RF Communication NRF24L01P+PA
AS01-ML01DP5 is a 2.4GHZ100mW, high speed (maximum air speed up to 2Mbps) high stability, industrial grade wireless transceiver integrated digital transmission module. Module uses nRF24L01P RF chip and RFX2401C power amplifier chip, built in LNA, the receiving sensitivity of 10dBM, working in the...
Adafruit SGP40 Air Quality Sensor Breakout - VOC Index - STEMMA QT / Qwiic
The Adafruit SGP40 is a next-generation MOX (metal-oxide) gas sensor from Sensirion for indoor air quality monitoring. Unlike its predecessor the SGP30, the SGP40 outputs a raw signal that is processed through Sensirion's VOC algorithm to produce an overall air quality index from 0 to 500 — rathe...
Adafruit TMP117 ±0.1°C High Accuracy I2C Temperature Sensor - STEMMA QT / Qwiic
The Adafruit TMP117 is a high-accuracy I2C temperature sensor from Texas Instruments, offering 16-bit resolution (0.0078°C) and up to ±0.1°C accuracy across the most common temperature ranges. It's ideal for applications where precise temperature monitoring is critical, such as thermostats, cold ...
6V 2-Position 3-Way Air Valve for Arduino
The 6V 2-Position 3-Way Air Valve is a solenoid-driven pneumatic valve for controlling air flow direction in pneumatic systems. Like a relay, it features three interfaces: a common port (COM), a normally open port (NO), and a normally closed port (NC). Powering the valve on or off determines whic...
SparkFun Air Quality Sensor - SGP40 (Qwiic)
The SparkFun SGP40 Air Quality Sensor measures volatile organic compound (VOC) levels in indoor environments using Sensirion's CMOSens technology. The metal oxide (MOx) sensor with a temperature-controlled micro hotplate provides humidity-compensated air quality readings via I2C with Qwiic connec...
Magnetic Contact Switch Sensor for Arduino
This magnetic switch (reed switch) consists of two magnetic reeds (usually composed of iron and nickel) sealed in a plastic case. The two magnetic reeds are overlapped but there is a small gap between them. When a suitable external magnetic field comes within 2cm, the two magnetic reeds will cont...
Gravity: PH3 Sensor (Calibrated) - I2C & UART
This is a sensor that detects phosphine concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of phosphine in the environment. Can be widely used in the detection of phosphine ...
Gravity: O3 Sensor (Calibrated) - I2C & UART
This is a sensor that detects ozone concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of ozone in the environment. Can be widely used in industrial and environmental protec...
Gravity: SO2 Sensor (Calibrated) - I2C & UART
A factory-calibrated electrochemical sulfur dioxide (SO2) sensor with I2C, UART, and analogue output modes. Part of the DFRobot Gravity gas sensor series, this module quickly and accurately measures SO2 concentration for industrial monitoring and environmental protection applications. The electr...
Gravity: HCL Sensor (Calibrated) - I2C & UART
This is a sensor that detects hydrogen chloride concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of hydrogen chloride in the environment. Can be widely used in the detecti...
Gravity: NO2 Sensor (Calibrated) - I2C & UART
This is a sensor that detects nitrogen dioxide concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of Nitrogen Dioxide in the environment. Can be widely used in the detection...
Gravity: H2 Sensor (Calibrated) - I2C & UART
This is a sensor that detects hydrogen concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of hydrogen in the environment. Can be widely used in the detection of hydrogen in ...
