[Volt]

1. replace the battery in the hygrometer... Mine seem to last about 9 months accurately.

2. Calibrate the hygrometer with a pack or salt.

3. Add beads to help hold the RH solid.

4. Where is the Humi located. As things begin to heat up direct sun light, sitting under the ac vent can play with the numbers.

5. I find personally all the little hygrometers a crap. I just load my humis up with 65% beads. Mine smoke perfect, no tunneling, uneven burns, and less worries.