Ruuvi Blog

Q: How do I know if my humidity sensor needs calibration?

If you notice that the readings from your humidity sensor are consistently off, that is a good indication that it may need calibration. You can also perform a simple "salt test" or use a reference humidity sensor to check the accuracy of your sensor.

Q: Can I calibrate my humidity sensor myself?

Yes, it is possible to calibrate some humidity sensors yourself using a reference humidity source or a salt test. In most use cases, this method offers accurate enough readings for calibration for consumer purposes.

Q: What is a salt test?

A salt test is a simple and inexpensive way to calibrate a humidity sensor. It involves placing a small amount of salt in a sealed container with the sensor and measuring the relative humidity inside the container. The relative humidity should read 75%, which is the equilibrium point of salt at room temperature. If the sensor reading is different, it may need calibration.

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