Calibration of a Hygrometer...would this work

[T.G]

Ha! Yeah, hygrometer. It's been a long day, my friend.

I understood the OP's question to be about using the packet you describe in item 1. I probably should have been more clear about that in my earlier answer.

I agree, the Fuente packs would probably only be good for traveldors.

The Fuente packs that I have are mostly 69RH, but I have one that is a 65 and thought I had another one around here with a third value on it, but I can't find it. It's either lost or maybe I gave it away. The RH levels are printed on the pack by a separate machine, they aren't part of the regular printing and the fonts aren't the same between the various packs. It includes some other info, possibly a lot/batch number. Now, it's possible that things have changed as these packs are old, I've had most of them since 2005 I think, and just keep recharging them. Just for grins, I threw one in a bag with a hygrometer to see what it does. Doesn't seem to be doing much. Maybe I should actually put a battery in my hygrometer first before trying this.

So, from what you're saying, it looks like the hygrometer kit is the same technology, just a more accurate pack. Thanks for the clarification.