That's the first thing I thought. I pulled the sensor from another location and had reading 2%. Pulled the third one from my garage and it read 1%. Yes they all had batteries only a couple of months old. I change them out when the clocks change. Same time I change out batteries in the smoke detectors. Also the same time I pull all my guns out of the safe and clean them. (A habit I got into many years ago.) Thats how I just ran across this discovery of it being so low. All I know is my hands are cracked and no amount of lotion helps! The static is so bad, handling powder or primers may be a bit iffy.
Don't want to tempt providence.