A: The laser counters used in PurpleAir sensors come factory calibrated. It is not possible to calibrate the laser counters post-production. If you suspect your sensor might have a laser counter misreporting, you can try cleaning the laser counters with a vacuum, shop vacuum, or canned compressed air.
Before shipment, we verify that each sensor is reporting data that are consistent from sensor to sensor during tests in a smoke chamber.
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Learn more about sensor maintenance.
Learn more about how the sensors function.
Learn more about how we measure air quality.