You know what - my digital was coming up with some odd (but consistent) numbers so I put it to the salt test - it's sitting at 59% RH. Temperature is accurate... How the heck could a digital be off by that much?

A little background - the digital hygrometer is about 8 years old - hadn't used it in 5 years(?) - no battery, so I took it to Target and the watch person just found one that fit. Screen lit up so I assumed it was ok. Temperature is accurate - but again, my questions:

1. Can a digital really be off by 16%?
2. Is it that my hygro is just old?
3. Does the size (and thus the power) of the battery affect the reading (and then only the RH and not the temp)?

Gonna go look for a hygro...

Happy Easter all.