Air particle counter reversion.

In order to make air particle counter looks more professional so traditional version we use aluminum box as package.
For 2016 we all change the aluminum box into giftbox so that looks better and save shipping cost, size will be smaller.
About the machine, we new add the effective rate function display by %, before and after using air purifier will give how many %
air quality increase.
There are 6 latest history record to check, currently result display in green color
New pm2.5 standard basic on USA standard or WHO international standard so that better for air purifier distributors use.
35s sampling time already include the machine calibration time, so even after a long term use particle counter do not need to do calibration.

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