Humidity Stuck at 99%

If your hygrometer is showing a constant 99% humidity reading, don’t worry — that’s usually caused by a sensor issue that can often be fixed with a quick reset. Please try the following steps:

1. Remove the batteries and leave them out for at least 60 seconds.

2. Reinsert new, fresh batteries to rule out any low power issue.

3. Place the device in a dry indoor area (such as near a dehumidifier or in an air-conditioned room) for about 30 minutes and check if the humidity reading changes.

If the reading remains stuck at 99%, the sensor may be faulty and you could be entitled to a replacement if your device is within warranty.