Most orders arrive within 5–11 business days once dispatched. You'll receive a tracking number to follow your order every step of the way.
Pressus AirQ CM421
Pressus AirQ CM421
4-in-1 CO & Gas Detector | Real-Time CO, Gas, Temp & Humidity Display
Regular price
£69.99
Regular price
£69.99
Sale price
£99.99
Unit price
per
SAVE 30%
Sold out
Detects CO and combustible gas
2.1" HD color screen display
Real-time temp and humidity
Plug-in, no batteries needed
180° flip screen, any outlet
Free Shipping
1-Year Warranty
Couldn't load pickup availability
-
-
-
-
-
-
-
Free Shipping
24/7 Customer Support
Easy Returns
Pressus AirQ CM421
Regular price
£69.99
Regular price
£69.99
Sale price
£99.99
Unit price
per
SAVE 30%
Sold out
Pressus AirQ CM421 - Product Details
60-Day Money-Back Guarantee
60
Day
Guarantee
Try it completely risk-free for 60 days.
We're confident the Pressus AirQ CM421 will give you real peace of mind in your home — but if for any reason you're not completely satisfied, we'll refund you in full. No awkward questions, no long waits.
1
Contact Us
Email support@pressusstore.com within 60 days of receiving your order.
2
Return It
We'll guide you through the simple return process — we keep it straightforward.
3
Get Refunded
Your full refund is processed promptly — no delays, no nonsense.
Features
Real-Time CO Detection
Monitors carbon monoxide concentration live in ppm — continuously updated so you know the moment levels start to rise, before symptoms appear.
Combustible Gas Detection
A color-coded bar indicator tracks combustible gas levels in real time — shifting from green through yellow to red as concentration increases. Visible at a glance from across the room.
Live Temperature & Humidity
Temperature and humidity display alongside CO and gas readings on the same screen — four readings at once, without needing multiple devices for a complete picture of your indoor environment.
2.1" HD Color Screen
All readings display in real time on a bright 2.1" HD color screen — clearly laid out and easy to read in any light without squinting at small figures.
Dual S1 / S2 Sensitivity Modes
S1 (low sensitivity) targets methane and combustible gas. S2 (high sensitivity) targets alcohols, butane, benzene, ethylene oxide, and acetylene. Hold the brightness button to switch — the active mode shows on screen.
180° Flippable Screen
Depending on socket orientation, the unit may plug in upside down. Long-press the bell button to flip the display 180° so the screen always reads the right way up, regardless of how the plug is inserted.
3 Brightness Levels
Adjust screen brightness across three levels to suit the room. The lowest setting is designed to be sleep-friendly — dim enough not to disturb sleep but visible if you need to check overnight.
LED Indicator
An LED indicator provides at-a-glance status without looking at the screen — useful in peripheral vision when you just need a quick confirmation that all is well.
Plug-In & Always On
Powered directly from a wall socket — no batteries, no charging, no interruptions. Plug it in once and it monitors continuously from that moment on.
No App or Subscription
Works entirely as a standalone device — no account, no app, no recurring fees. Plug it in and it starts detecting immediately. That's it.
Specifications
CO Detection Real-time ppm reading, continuously updated Gas Detection Combustible gas — color-coded bar indicator Sensitivity Modes S1 (low): methane, combustible gas · S2 (high): alcohols, butane, benzene, ethylene oxide, acetylene Additional Readings Temperature, Humidity Display 2.1" HD color screen — CO ppm, gas bar, temp, humidity Screen Orientation 180° flip (long-press bell button to flip) Brightness Settings 3 levels (includes sleep-friendly low mode) LED Indicator Yes Power Plug-in (wall socket) — no battery required App Required No Subscription None Suitable For Kitchen, utility room, garage, living space, bedroom
Shipping Details
Your order is in safe hands. Here's everything you need to know before it arrives:
Estimated Delivery
Shipping Cost
✓ FREE shipping — no hidden fees, ever.
Need Help?
Any questions about your order? Our team is ready to help — reach us at support@pressusstore.com
Questions About Your Order?
Our support team typically responds within a few hours
support@pressusstore.com
-
"Had an older boiler and a gas hob and always had a nagging feeling something wasn't right. This plugs straight in and the readings are clear. Nothing alarming so far but it's good to actually know."
-
Plugged it in near the boiler and it's been running since. Screen is easy to read and doesn't disturb at night on the low brightness setting. Does exactly what I needed
-
"My dad uses his garage as a workshop with gas tools. Got him one of these and now we both feel better about it. The dual sensitivity modes are a useful feature."
View full details
Regular price
£69.99
Regular price
£69.99
Sale price
£99.99
Unit price
per
Detects CO and combustible gas
2.1" HD color screen display
Real-time temp and humidity
Plug-in, no batteries needed
180° flip screen, any outlet
Free Shipping
1-Year Warranty
Couldn't load pickup availability
Free Shipping
24/7 Customer Support
Easy Returns
Pressus AirQ CM421
Regular price
£69.99
Regular price
£69.99
Sale price
£99.99
Unit price
per
60-Day Money-Back Guarantee
60
Day
Guarantee
Guarantee
Try it completely risk-free for 60 days.
We're confident the Pressus AirQ CM421 will give you real peace of mind in your home — but if for any reason you're not completely satisfied, we'll refund you in full. No awkward questions, no long waits.
1
Contact Us
Email support@pressusstore.com within 60 days of receiving your order.
2
Return It
We'll guide you through the simple return process — we keep it straightforward.
3
Get Refunded
Your full refund is processed promptly — no delays, no nonsense.
Features
Real-Time CO Detection
Monitors carbon monoxide concentration live in ppm — continuously updated so you know the moment levels start to rise, before symptoms appear.
Combustible Gas Detection
A color-coded bar indicator tracks combustible gas levels in real time — shifting from green through yellow to red as concentration increases. Visible at a glance from across the room.
Live Temperature & Humidity
Temperature and humidity display alongside CO and gas readings on the same screen — four readings at once, without needing multiple devices for a complete picture of your indoor environment.
2.1" HD Color Screen
All readings display in real time on a bright 2.1" HD color screen — clearly laid out and easy to read in any light without squinting at small figures.
Dual S1 / S2 Sensitivity Modes
S1 (low sensitivity) targets methane and combustible gas. S2 (high sensitivity) targets alcohols, butane, benzene, ethylene oxide, and acetylene. Hold the brightness button to switch — the active mode shows on screen.
180° Flippable Screen
Depending on socket orientation, the unit may plug in upside down. Long-press the bell button to flip the display 180° so the screen always reads the right way up, regardless of how the plug is inserted.
3 Brightness Levels
Adjust screen brightness across three levels to suit the room. The lowest setting is designed to be sleep-friendly — dim enough not to disturb sleep but visible if you need to check overnight.
LED Indicator
An LED indicator provides at-a-glance status without looking at the screen — useful in peripheral vision when you just need a quick confirmation that all is well.
Plug-In & Always On
Powered directly from a wall socket — no batteries, no charging, no interruptions. Plug it in once and it monitors continuously from that moment on.
No App or Subscription
Works entirely as a standalone device — no account, no app, no recurring fees. Plug it in and it starts detecting immediately. That's it.
Specifications
| CO Detection | Real-time ppm reading, continuously updated |
| Gas Detection | Combustible gas — color-coded bar indicator |
| Sensitivity Modes | S1 (low): methane, combustible gas · S2 (high): alcohols, butane, benzene, ethylene oxide, acetylene |
| Additional Readings | Temperature, Humidity |
| Display | 2.1" HD color screen — CO ppm, gas bar, temp, humidity |
| Screen Orientation | 180° flip (long-press bell button to flip) |
| Brightness Settings | 3 levels (includes sleep-friendly low mode) |
| LED Indicator | Yes |
| Power | Plug-in (wall socket) — no battery required |
| App Required | No |
| Subscription | None |
| Suitable For | Kitchen, utility room, garage, living space, bedroom |
Shipping Details
Your order is in safe hands. Here's everything you need to know before it arrives:
Estimated Delivery
Shipping Cost
✓ FREE shipping — no hidden fees, ever.
Need Help?
Any questions about your order? Our team is ready to help — reach us at support@pressusstore.com
Questions About Your Order?
Our support team typically responds within a few hours
support@pressusstore.com-
"Had an older boiler and a gas hob and always had a nagging feeling something wasn't right. This plugs straight in and the readings are clear. Nothing alarming so far but it's good to actually know."
-
Plugged it in near the boiler and it's been running since. Screen is easy to read and doesn't disturb at night on the low brightness setting. Does exactly what I needed
-
"My dad uses his garage as a workshop with gas tools. Got him one of these and now we both feel better about it. The dual sensitivity modes are a useful feature."
Four Readings. One Screen. Always On.
CO, gas, temperature, and humidity — monitored live and displayed clearly, so you're never left guessing.
CO Detection
Live CO levels in ppm, continuously updated so you know the moment concentration starts to rise.
Gas Detection
Color-coded bar shows combustible gas levels in real time — green to red as concentration increases.
Plug-In & Always On
No batteries, no charging. Plug it in and it monitors continuously from the moment it's connected.
Temperature & Humidity
Both displayed live alongside CO and gas — a complete picture of your indoor environment at once.
Why Thousands Choose Pressus
-
Finally feel safe in the kitchen
Had an older boiler and a gas hob and always had a nagging feeling something wasn't right. This plugs straight in and the readings are clear. Nothing alarming so far but it's good to actually know.
-
Simple and does what it says
Plugged it in near the boiler and it's been running since. Screen is easy to read and doesn't disturb at night on the low brightness setting. Does exactly what I needed
-
Great for peace of mind
My dad uses his garage as a workshop with gas tools. Got him one of these and now we both feel better about it. The dual sensitivity modes are a useful feature.
-
Got two, one for each room
Put one in the kitchen and one near the utility room. Both give consistent readings and the color bar makes it easy to check at a glance. Wish I'd done this sooner.
Pressus vs. Other Brands
CO, gas, temp, and humidity. One screen. Dual sensitivity. No fuss.
|
Others | |
|---|---|---|
| Live CO reading in ppm | ||
| Combustible gas detection | ||
| Live temperature display | ||
| Live humidity display | ||
| Dual S1/S2 sensitivity modes | ||
| 2.1" HD color screen | ||
| 180° flippable screen | ||
| 60-day money-back guarantee |
Results
Real customers. Real impact. Here's what users experienced after setting up:
Customer Satisfaction
92%
said the color-coded gas bar made it immediately clear when levels were elevated
88%
said having CO, gas, temperature, and humidity on one screen was more useful than expected
85%
said the plug-in design made it easier to leave running continuously
94%
said they would recommend the AirQ CM421 to a friend or family member
Verified customer satisfaction survey results.
Up and Running in Seconds.
-
1. Plug It Into Any Wall Socket
The AirQ CM421 plugs directly into a standard wall socket — no wiring, no drilling, no setup. If the screen appears upside down due to your socket orientation, long-press the bell button to flip it 180°. Done.
-
2. Place It Where It Matters
Put it in any room where CO or gas risk is a concern — near a boiler, gas hob, utility room, or garage. The screen faces forward automatically. Adjust brightness with a button press to suit the room.
-
3. Watch It in Real Time
The 2.1" HD screen displays your CO level in ppm, a color-coded gas bar, and live temperature and humidity — all at once, all the time. Green means safe. If anything changes, you'll see it immediately.
60
Day
Guarantee
Guarantee
60-Day Money-Back Guarantee
Use the Pressus AirQ CM421 in your home for 60 days. If for any reason you're not completely satisfied, return it for a full refund. No awkward questions, no long waits — just complete peace of mind from day one.
Full 60-day trial period
Simple, hassle-free returns
Full refund, no questions asked
CO · Gas · Temperature · Humidity. One Screen.
Never Wonder What's
in the Air Again.
Real-time CO in ppm. Combustible gas detection with a color-coded bar. Live temperature and humidity. Dual S1/S2 sensitivity modes. 180° flip screen. Three brightness settings including a sleep-friendly low mode. Plug in and it works — no app, no subscription.
Free Shipping
60-Day Money-Back Guarantee
Secure Checkout
No Subscription
No hidden fees · No subscription · Delivered to your door
Frequently asked questions
Shipping & returns
Shipping & returns
Free shipping on all orders. Not satisfied for any reason? Contact us within 60 days at support@pressusstore.com for a full refund.
What does CO detection protect me from?
What does CO detection protect me from?
Carbon monoxide is a colorless, odorless gas produced by boilers, gas appliances, fires, and vehicles. At elevated levels it causes headaches and dizziness, and in serious cases can be fatal. The AirQ CM421 monitors CO in real time so you know the moment levels start to rise — before symptoms appear.
What's the difference between S1 and S2 mode?
What's the difference between S1 and S2 mode?
S1 is low sensitivity, best suited for detecting methane and general combustible gas. S2 is high sensitivity, suited for alcohols, butane, benzene, ethylene oxide, and acetylene. Hold the brightness button to switch — the current mode shows on screen.
What does the gas bar indicator show?
What does the gas bar indicator show?
The color bar shows combustible gas concentration in real time. Green means low, yellow means moderate, and red means elevated — you can see the level shift as it changes.
Does it detect CO2?
Does it detect CO2?
No. The AirQ CM421 detects carbon monoxide (CO), not carbon dioxide (CO2). CO is the dangerous, odorless gas associated with faulty boilers and appliances.
Where should I place it?
Where should I place it?
Near gas appliances, a boiler, or in any room where CO risk is a concern — kitchens, utility rooms, garages, and living spaces are the most common locations.
What does the 180° flip screen do?
What does the 180° flip screen do?
Depending on your socket orientation, the unit may plug in upside down. Long-pressing the bell button flips the display 180° so the screen always reads the right way up, regardless of how the plug is inserted.
Can I use it in a bedroom?
Can I use it in a bedroom?
Yes. The three brightness settings include a low mode designed to be sleep-friendly — the screen dims without switching off, so it's readable without disturbing sleep.
Does it need an app or subscription?
Does it need an app or subscription?
No. The AirQ CM421 works as a completely standalone device — no app, no subscription, no account needed. Plug it in and it starts detecting immediately.
