VASAIKO HD16 6-in-1 CO Monitor with Real-Time Display
See What Your CO Alarm Can't
UL-listed alarms are required to ignore CO below 30 ppm — and to show you "0". HD16 shows the real number.
Keep your alarms. Add the layer they were never allowed to give you.
HD16 is a supplemental monitor. It is not a substitute for UL 2034-listed CO alarms or UL 217-listed smoke alarms required by your state or local code. Keep your existing alarms installed and maintained.
Why VASAIKO HD16 Stands Out
One compact device adds what your alarms were never allowed to show.
Shows the live reading — not a forced zero
See exactly what's in the air — CO, gas, smoke, temperature and humidity readings on a clear backlit screen.
- Live PPM & PPM trend
- Temperature & humidity
- Battery status at a glance
6 hazards, one screen — CO, combustible gas, smoke, temp, humidity
Carbon monoxide, natural gas, smoke, temperature, humidity and power — six sensors in one smart unit.
- CO + Gas + Smoke detection
- Temp & humidity monitoring
- One device, full coverage
Electrochemical CO sensor
The sensor type used by professional low-level monitors — the same technology inside most certified alarms. The difference is what HD16 lets you see.
- Professional-grade sensing element
- Responds to low-level CO
- No consumable calibration gas needed
Instant Loud Alarm
An 85dB alarm wakes the whole house the moment danger is detected — because every second counts.
- 85dB audible alert
- Visual + audible warning
- Smart silence & test button
Magnetic Mount, 5-Second Setup
Plug it in or stick it to any metal surface with the magnetic back. No wiring, no tools, no fuss.
- Plug-in powered
- Magnetic detachable mount
- Up & running in 5 seconds
Where Your Family Needs Protection Most
From the bedroom to the garage — HD16 keeps watch everywhere you live.
Sleep Safe Every Night
Silent CO leaks are deadliest while you sleep. HD16 guards your bedroom 24/7 so you wake up safe.
- Night-time CO monitoring
- Quiet, always-on watch
Catch Fires Before They Spread
Cooking is the #1 cause of home fires. HD16's smoke sensor gives you early warning before flames grow.
- Early smoke detection
- Fast 85dB alert
The Silent CO Threat
Car exhaust and gas appliances make garages & basements the most dangerous CO zones in the home.
- CO from vehicles & boilers
- Ideal for enclosed spaces
Protection On The Go
Take peace of mind on the road. HD16's plug-in + magnetic design fits any RV, cabin or tent setup.
- Portable & lightweight
- Works on 12V & wall power
Why your alarm has been showing you "0"
Same sensor technology. Their firmware is required to hide the number. Ours shows it.
| CO Level | UL-Listed Alarm (Kidde / First Alert / X-Sense) | HD16 |
|---|---|---|
| 0–29 ppm | Must stay silent; if it has a display, it must read "0" | Shows the live reading |
| 30–69 ppm | May stay silent, or warn after 1 hour (most brands don't) | Live reading + alert |
| 70 ppm | Must alarm within 60–240 minutes | Live reading + alert |
| 150 ppm+ | Must alarm within 10–50 minutes | Live reading + alert |
That's not a defect — it's the standard. UL 2034 requires certified alarms to ignore everything below 30 ppm to avoid nuisance calls. HD16 simply isn't playing by that rule.
Source: Based on UL 2034 alarm thresholds and CPSC conformance testing.
What Your Reading Actually Means
Electrochemical sensors drift slightly and can react to everyday household vapors. Here's how to read the number.
| Reading | What it means |
|---|---|
| 0–9 ppm | Typical. The EPA 8-hour outdoor standard is 9 ppm. |
| 10–29 ppm | Worth watching. Often from ovens, fireplaces, or a car idling in an attached garage. Ventilate and re-check. |
| 30 ppm+ | Act. Ventilate, move everyone to fresh air. If your UL-listed alarm sounds, get out and call 911. |
Good to know: ① Gas stoves commonly produce brief readings of 5–15 ppm even when working properly (EPA). ② This is a monitor, not a laboratory instrument. Readings are for awareness and trend-watching — not for diagnosis.
Based on 2,140 verified reviews
"Finally one device that does it all. The screen is so clear and setup took 5 minutes."
"Bought two for the bedroom and garage. Sleep so much better knowing it's watching."
"Loud alarm actually woke my teenage son. Worth every penny."
"Magnetic mount stuck right to my RV wall. Perfect for camping trips."
"The display shows exact readings — no more guessing if it's a false alarm."
"Best $39 I've spent on home safety. Already recommended to my whole family."
Add the missing layer With VASAIKO HD16
Join 151,637+ American families who trust VASAIKO for 24/7 safety.
Everything you need to know before you buy
Real answers to the questions families ask us most about CO protection.
What does "PPM" on the display mean?+
How is this different from a $20 basic detector?+
Where should I place it?+
Will it false-alarm from cooking or steam?+
What happens if the power goes out?+
Is it certified and built to last?+
Keep your alarms. Add the missing layer.
