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  1. Mar 2020
  2. www.amazon.com www.amazon.com
    Nova PM Sensor SDS011 High Precision Laser PM2.5 Air Quality Detection Sensor Module Super Dust Sensors Digital Output with USB: Amazon.com: Industrial & Scientific
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    1. tjwatkins 05 Mar 2020
      Price: $26.00

      high precision sensor noted in article also pinned $26

      $26 sensor UALR IOT class IOT gas sensor
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    amazon.com/Precision-Quality-Detection-Sensors-Digital/dp/B07KNTZZW9