Benzene, Toluene, Acetone, Formaldehyde Sensor MQ138 Breakout with Qwiic
Best price from 1 store
£30.50 GBP
Lowest ever
Lowest ever
Best price at The Pi Hut
Priced in GBP — no conversion needed
Priced in GBP — no conversion needed
104 total views
104 total views52-wk Low
£30.50
Average
£30.50
52-wk High
£30.50
Priceino Verdict
Priceino VerdictA quick read on fit, value and timing.
A versatile sensor breakout for VOC detection, offering convenience and multi-gas capability. Consider your calibration needs and accuracy requirements before purchase.
Good fit for
Good fit for
Air quality monitoring projectsIndustrial safety applications (non-critical)Educational STEM activities on gas sensing
Avoid if
Avoid if
You need precise quantitative measurements (consider more expensive sensors)You prefer analog-only connections without I2C
Where to buy
Prices verified within 48 hours30-day price prediction
Price likely to remain stable over the next 30 days
40%
confidence
Price has been relatively stable over the last 30 days
Currently at all-time low — historically tends to rise after
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About this product
The MQ138 Breakout with Qwiic is a sensor module designed to detect volatile organic compounds (VOCs) including benzene, toluene, acetone, and formaldehyde. It integrates the MQ138 gas sensor with a Qwiic connector for easy I2C interfacing, making it suitable for hobbyists and professionals monitoring air quality.
Key features
- Detects benzene, toluene, acetone, formaldehyde, and other VOCs
- Qwiic connector for plug-and-play I2C interface
- Compatible with Arduino, Raspberry Pi, and other microcontrollers
- Analog and digital output options (via Qwiic or header pins)
- On-board voltage regulator and signal conditioning
Pros
- Easy integration with Qwiic ecosystem
- Multi-gas detection capability
- No soldering required for Qwiic connection
- Works with popular microcontrollers
- Compact breakout board design
Cons
Cons- Requires calibration for accurate readings
- Heater needs warm-up time for stable output
- Sensitivity may vary between gases
Buying advice
Buying adviceWho should consider this product and what to check before buying.
This sensor is ideal for makers and engineers who need to monitor VOC levels in air quality projects. It's convenient for prototyping due to Qwiic connectivity, but be prepared to calibrate the sensor for your specific target gas. Value is good for those who require multi-gas detection in a compact module.
Price History
Last updated · 1 store
£30.50
Buy at The Pi Hut
Price Timeline
Price TimelineKey pricing milestones tracked by Priceino.
7 Aug 2026
First tracked
Priceino started monitoring this product
23 Oct 2026
Today — £30.50 · lowest ever
The cheapest we have ever recorded — a great time to buy
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Frequently asked questions
Frequently asked questionsCommon questions about buying this product.
Who is this product best for?
This product is best for electronics hobbyists, makers, and engineers who want to add VOC detection to their projects. It's especially convenient for those already using Qwiic-compatible microcontrollers, as it simplifies wiring and coding.
What should shoppers check before buying?
Shoppers should verify that their microcontroller supports I2C and Qwiic connectors, or be comfortable using the analog output pins. They should also consider the sensor's warm-up time, calibration requirements, and whether the detection range fits their application. Additionally, check the supply voltage and current requirements to ensure compatibility.
What is the best price for Benzene, Toluene, Acetone, Formaldehyde Sensor MQ138 Breakout with Qwiic?
The best current price for Benzene, Toluene, Acetone, Formaldehyde Sensor MQ138 Breakout with Qwiic is £30.50 at The Pi Hut. We track prices daily across multiple stores.
Is now a good time to buy Benzene, Toluene, Acetone, Formaldehyde Sensor MQ138 Breakout with Qwiic?
The price is around the historical average. Check our price history chart for trends.
How often does the price of Benzene, Toluene, Acetone, Formaldehyde Sensor MQ138 Breakout with Qwiic change?
We update prices daily. Use our price history chart to see how the price has changed over time and set a price alert to be notified when it drops.
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