In this video, we talk about how you can evaluate a relative humidity sensor by using the atmosphere of a solution saturated with table salt (sodium chloride). The expected humidity at 20C (68F) is 75.5% and 75.3% at 25C (77F).

We test a DHT11 sensor and show that it behaves in line with the expected accuracy of the sensor +/- 5%. Given the frequent deterioration of DHT11 sensors, this is a good method to test sensors routinely and confirm their accuracy.

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