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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?
Collections
Showing 61-80 of 100 products
Gravity: CO Sensor (Calibrated) - I2C & UART
This is a sensor that detects carbon monoxide 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 carbon monoxide in the environment. Can be widely applied to fields like portable devic...
Gravity: O2 Sensor (Calibrated) - I2C & UART
This is a sensor that detects oxygen 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 oxygen in the environment. Can be widely applied to fields like portable devices, ...
Gravity: H2S Sensor (Calibrated) - I2C & UART
This is a sensor that detects hydrogen sulfide 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 sulfide in the environment. Can be widely used in the detection...
Gravity: STCC4 True Carbon Dioxide (CO2) Sensor (3-in-1 Air Quality Monitoring, 400 ~ 5000ppm)
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This Gravity air quality module uses Sensirion’s STCC4 gas sensing chip to directly measure carbon dioxide with the thermal conductivity measurement principle. It is designed for compact, cost-effective indoor monitoring nodes where stable CO₂ readings are needed without complex hardware integrat...
Adafruit TMP119 ±0.03°C I2C Temperature Sensor
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Built around Texas Instruments' TMP119, this breakout makes it easy to add extremely accurate temperature monitoring to your project over I2C. It is designed for applications where temperature really matters, including thermostats, cold chain asset tracking, and gas or heat metering, and it can a...
STCC4 + SHT41 CO2, Temperature & Humidity Sensor
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This compact breakout combines the STCC4 CO2 sensor with a Sensirion SHT41 temperature and humidity sensor for convenient indoor air monitoring. The STCC4 measures true CO2 using a thermal conductivity method rather than estimating from VOCs, and the onboard SHT41 helps improve the CO2 measuremen...
BME680 Breakout - Air Quality, Temperature, Pressure, Humidity Sensor
The state-of-the-art BME680 breakout lets you measure temperature, pressure, humidity, and indoor air quality, and is Raspberry Pi and Arduino-compatible! Use this breakout to monitor every aspect of your indoor environment. Its gas resistance readings will react to changes in volatile organic...
Gravity: Formaldehyde (HCHO) Sensor (Arduino Raspberry Pi Compatible)
The Formaldehyde (HCHO) sensor is an Arduino & Raspberry Pi compatible module, which is the ideal solution for indoor air quality monitor. This is a HCHO(CH2O) sensor module. It can be used to measure HCHO in air. Through it, you can know the air quality. This sensor module is widely used ...
Gravity: Analog Infrared CO2 Sensor For Arduino (0~5000 ppm)
The concentration of carbon dioxide (0.03% usuallly) is related to daily life. Recently, there's a study showing that the atmospheric CO2 content has reached 0.0385% (385 ppm) which is the highest value since 2.1 million years. The raise of atmospheric CO2 content to some extent results in gl...
2:1 5mm Heatshrink Tubing 5m Black
Jaycar 2:1 heatshrink tubing in a convenient 5-metre roll, ideal for insulating solder joints, bundling wires, and protecting cable terminations. The 5mm diameter shrinks down to 2.5mm, providing a snug, protective sleeve over connectors and splices. Sold in a stackable box (49 × 177 × 165 mm) t...
Gravity: Intermediate(advanced) Kit for Arduino
The DFRobot Gravity Intermediate Kit for Arduino takes you beyond the basics with a comprehensive set of sensors, modules, and an Arduino-compatible board. Starting with simple LED projects and progressing to more complex builds like a mini electronic drum kit, sound-activated LED, and digital di...
Gravity: 27 Pcs Arduino Sensor Kit
INTRODUCTION If you want to start playing with sensors, this sensor kit for arduino will be the perfect choice for you to get started. It comes with bundle of the most popular DFRobot sensors such as light sensors, gas sensors, sound sensors, touch sensors, distance sens...
Adafruit BMP280 I2C or SPI Barometric Pressure Altitude Sensor
The BMP280 from Bosch is a precision barometric pressure and temperature sensor, and the next-generation upgrade to the BMP085/BMP180/BMP183 family. With support for both I2C and SPI communication, it offers flexibility for a wide range of weather sensing and altitude estimation projects. With ±...
Grove - Alcohol Sensor
Alcohol sensor is semiconductor sensor for alcohol detection. It has good sensitivity and fast response to alcohol, suitable for portable alcohol detector. Specifications Power requirements: 5 VDC @ ~120 mA (heater on) Detection Gas: Alcohol Concentration: 20-1000ppm Alcohol Inter...
Adafruit SGP30 Air Quality Sensor Breakout - VOC and eCO2
The Adafruit SGP30 is a multi-pixel MOX (metal-oxide) gas sensor from Sensirion that measures Total Volatile Organic Compounds (TVOC) and equivalent CO2 (eCO2) for indoor air quality monitoring. With fully calibrated output signals and I2C interfacing, it provides a straightforward way to detect ...
Gravity: Analog Water Pressure Sensor
The Gravity Analog Water Pressure Sensor measures water or gas pressure and outputs a linear 0.5–4.5 V analogue signal proportional to the applied pressure (0–1.6 MPa). Using the DFRobot Gravity 3-pin interface, it connects directly to Arduino and other 5 V microcontrollers for easy integration i...
Gravity: I2C BME680 Environmental Sensor (VOC, Temperature, Humidity, Barometer)
DFRobot BME680 Environmental Sensor is a low power gas, pressure, temperature & humidity sensor based on BOSCH BME680 sensor. It is a 4-in-1 multi-functional MEMS environmental sensor which integrates VOC (Volatile Organic Compounds) sensor, temperature sensor, humidity sensor and barometer. ...
2:1 3mm Heatshrink Tubing 5m Black
A 5-metre roll of 2:1 ratio heatshrink tubing in black, with a 3 mm pre-shrink diameter. Shrinks to half its original size when heated, providing insulation, strain relief, and protection for solder joints, wire splices, and cable connections. Supplied in a neat box for workshop storage. Shrink ...
Piezo Ignition Micro Torch
Ideal for brazing, silver soldering, jewellery work, heat shrinking, plumbing and general hobby work. Includes bonus stand. Features: - Adjustable flame. - Portable. - Use our NA-1020 butane gas refill. - Size 155mm high x 35mm dia tank. Specifi...
Adafruit BMP388 - Precision Barometric Pressure and Altimeter
The BMP388 from Bosch is a high-precision barometric pressure and temperature sensor, offering significantly improved altitude accuracy over the BMP280. With altitude noise as low as 0.1 metres and a relative accuracy of 8 Pascals (±0.5 m), it is an excellent choice for drone altitude hold, weara...
