What's the formaldehyde detector accurate

Formaldehyde gas we call HCHO or CH2O
It is very unstable toxic gas deaply hurt to human body. Easy to volatilize.
In new decorate house and new painting furniture with high content formaldehyde gas easy to cause tears, stun and breath system disease.
Different area in the same room HCHO gas content also different so formaldehyde detector data always changing.
Only the engineer can give answer is make it trend to the most accurate but can;t not give very certainly answer what's the accurate level.

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