So I bought this device and I am very happy about it. I followed all the instructions and the thing just doesn't work! I calibrated it, I took it to an area where I KNOW the air is unhealthy and it showed the air to be "healthy"! Meanwhile, in my house, where the air is healthy because I use a premium air purifier, he said "unhealthy." smh! The numbers fluctuate for no reason and this device is just rubbish. I'm so sad! The battery life is not good and I really think I have a defective device! I will return it and find something accurate and worth $200! SIGH.
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