CALIBRATION

[NavyChap]

I realize that this topic has come up in the past -- but I need help from all the guitar sages on a simply question.  The instructions I have use sale, water and a ziplock bag -- my question is this:  Can I place more than only one hygrometer in the bag?  I have four (4) D'Adarrio Humiditraks  -- do I have to do them one at a time or can I calibrate all four in the same bag???  Thanks in advance!!!

[chriskswenson]

I don't see any reason why you can't place more than one in the bag. I've calibrated both of hygrometers at the same time.