[RWhisenand]

If you have an electronic hygrometer it works by reading the electrical resistance across a medium such as lithium chloride. As the batteries begin to degrade, the slight decrease in voltage will effect the resistance across the lithium chloride causing a false reading. By switching to lithium ion batteries you will reduce this need for calibration but not eliminate it altogether.


How this helped, BtW I spent 17 years in the field as an instrumentation tech, prior to moving into systems integration, and now management. I dig this stuff.