The Home is meant to be used indoors in rooms where you spend most of your time.
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We recommend that you always keep the device measuring in areas with below 85% relative humidity. The sensor is an open air sensor which allows air to flow freely into the radon chamber so it is sensitive to the environment it is in - exposure to humidity levels over 85% can cause irreversible damage to the radon sensor.
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If you used your device in humid environments and are getting error messages, you could have success leaving the device in a dry environment for 24 hours before trying a reset.