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by jly
2775 days ago
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I bought one of these earlier this year: https://kaiterra.com/products/laser-egg-2-plus/ They are hard to find and buy in the US, but very popular in China where many cities have major air quality issues. I picked one up on ebay. Most of these consumer-grade PM2.5 monitors seem to use the same basic laser scatter sensor that measures 0.3um+ particles. |
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