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Salt will give a ball park of how accurate the device being tested is, you run the test 3 times and if the results show that your device is consistently low by 6% then you take this into account each time you take a reading when in use. If the rests are all over the place, send it back to China. I agree that determining the usefulness of a device this way is not a 'perfect' situation because the same device that consistently read low by 6% @ 75% RH in the salt bag may read + or - a few % at our working level of 45%, but the reality is that for most builders 5 or even 10% either side of 45% will make absolutely no difference whatsoever to the out come, what is important is that work is carried out at a 'consistent' RH more so than shooting for exactly 45%.

Sure if your winter involves ice and snow you are best to build with the RH on the lower side of 45% for obvious reasons, but over all I reckon the RH topic is a lot like using HHG, you don't need to make it that precise to work for you, there are plenty more important things to become perplexed about and over complicating things beyond their functional outcome serves no other purpose than to freak out those new to the craft.

Cheers

Kim

I agree Kim about overcomplicating things.
My motto is just build it, and see what happens.
I glued the braces on a top when the rh was probably pushing 100%.
Raining outside, moisture surely coming up through the concrete floor.
Pretty extreme situation, but I didn't know any better.
I build when I can't work, because of rain, or whatever.
That top sat for a bit, a few months, and went concave.
I glued it on anyway, and it's my favorite sounding, and looking guitar!
Big flaw though.
That's why I'm concerned with rh.
I will not be cocerned about rh being perfect, because I really can't at this time.
I'll just be more careful.