What’s the handheld particle counter do?

Handheld particle counter is very new products even at present no many people know it,
However, it will being the new store for direct selling and air purifier market.
Let’s make an example to explain it.
If you are selling air purifiers, how can you persuade your customers?
handheld particle counters detecting air quality, also store 6 detecting result.
It means you detecting the air quality before and after using air purifier,
then we can show the result to customers and tell them what happen about the air quality after using air purifier.
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