Carbon Dioxide Checker

Safe carbon monoxide monitor with CO detection function.
- Product Name: Carbon Monoxide Detector
- Function: CO detection function
- Test Button: Equipped with TEST button
- Installation Method: Wall mountable
- Accessories: Complete set of mounting screws
　Batteries are not included
Emits an audible warning sound
The display surface has a protective film attached.

I purchased this used because I wanted to know the concentration level when boiling water on a stove while camping in my car.
I found that boiling water did not cause any issues, so I no longer need to measure it regularly and am selling it.
The photos show the product tested with incense.