There are too many places to see, the frequency of fan rotation is a little concerned that the electricity is not enough, full of an estimate the most multipurpose day, there is also a calibration problem, Is the standard in a poor environment better than Shenzhen?
Very good use, automatic inspiration every minute, constantly updating the value, feeling can also, home pm2. 5 e,xceeds the standard
Well, it's okay. Formaldehyde doesn't know how. It's not. Ha ha ha.
It's also possible to use it, but there's no contrast, so I bought another brand.
Make use of outdoor as the calibration base point, obviously not the professional instrument, play a play and do,!
The feeling is not stable enough, the requirements of calibration conditions are high, and each time-on formaldehyde needs to be re-calibrated, so that it can only be used for reference before and after being used, so that the actual exact content cannot be determined.
How can formaldehyde always be 0, I feel very unlikely, go out and calibrate tomorrow! Try it, it's good, it's a very sensitive machine!
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