I don’t have anything calibrated; this device supposedly calibrates itself to outside air ppm?
Fixed link!
Have you measured “outside air” with it?
Yes: stays pretty close to 400
That’s good evidence to have!
I don’t have anything calibrated; this device supposedly calibrates itself to outside air ppm?
Fixed link!
Have you measured “outside air” with it?
Yes: stays pretty close to 400
That’s good evidence to have!