Maybe it is picking up Ozone?
Electronic air cleaners can produce ozone and a electric switch is carrying current and maybe produces a tiny amount of ozone?
We don't know what technology Fieldpiece uses to read Oxygen molecules and maybe it gets confused.
I would e-mail them and see if their tech support or engineers can help you.
If you want to test the unit then put it near your car exhaust pipe.
Electronic air cleaners can produce ozone and a electric switch is carrying current and maybe produces a tiny amount of ozone?
We don't know what technology Fieldpiece uses to read Oxygen molecules and maybe it gets confused.
I would e-mail them and see if their tech support or engineers can help you.
If you want to test the unit then put it near your car exhaust pipe.
