Long-term feedback: SONOFF SNZB-02D humidity/temperature sensor

https://feddit.uk/post/31377166

How did you check the accuracy of the humidity sensor? All of the cheap ones tend to drift/fail fairly quickly, especially if there is condensation (high humidity). This includes initially highly accurate sensors like BME280.

I knew this would come up, which is why I threw in the “ok for consumer gear” line.
I don’t have any super accurate sensors at home to test against, but to be honest, cheap hydrometers are best for vague ranges. “It’s damp”, “it’s normal”, or “It’s dry”.
Which is actually what I use it for: It’s in the bathroom to send alerts to open or close the windows based on humidity and outside conditions.

Compared to the rest of the sensors in the house, when the windows are open and air in the house is normalised, it’s within 5%, which is about all I could really hope for.

Sling psychrometer