The outdoor humidity on this just-purchased unit shows 1%, and the indoor humidity fluctuates between 1 and 14%. My Ambient Weather station shows an indoor humidity of 27% and outdoor humidity of 22%. The temperature appears to be accurate. The outdoor sensor has new batteries, the indoor unit has new batteries and is plugged in. Both units are set to position "B." The outdoor sensor is mounted on the side of the house and is shaded by a nearby bush...the sun never shines there. The signal strength indicator is at the highest level. I purchased this unit so I would not have to walk across the house to see the temperature.