Portable compact air detector
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I was wondering if there are any portable air quality monitors available in China – small and easy to carry, devices that can detect whether levels of CO2, formaldehyde, and other substances in the air exceed safe limits. It doesn’t need to be highly professional; something that can provide only a rough assessment will do! The price shouldn’t be too high; a few hundred yuan should be sufficient.
We use oxygen analyzers and formaldehyde detectors imported from Germany. 20,000 per piece. There should be some available in China as well; you can try searching on Baidu
Our company has purchased portable dissolved oxygen meters that can measure the oxygen content in water; they are made by Shanghai Precision Instrument Factory. You might want to consult them regarding other similar instruments like the one you mentioned – domestic instruments come at a reasonable price.